Document:

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                                                                    EXHIBIT 4.10

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                        PINNACLE WEST CAPITAL CORPORATION

                                       AND

                              THE BANK OF NEW YORK

                           as Purchase Contract Agent
                                   and Trustee

                              --------------------

                           PURCHASE CONTRACT AGREEMENT

                              --------------------

                            DATED AS OF
                                       -----------
================================================================================

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                                    TIE SHEET

<TABLE>
<CAPTION>
    Section of                                                                              Section of
Trust Indenture Act                                                                     Purchase Contract
of 1939, as amended                                                                          Agreement
-------------------                                                                     --------------------
<S>                                                                                     <C>
310(a)................................................................................  7.8
310(b)................................................................................  7.9(d) and (g), 11.8
310(c)................................................................................  Inapplicable
311(a)................................................................................  11.2(b)
311(b)................................................................................  11.2(b)
311(c)................................................................................  Inapplicable
312(a)................................................................................  11.2(a)
312(b)................................................................................  11.2(b)
313...................................................................................  11.3
314(a)................................................................................  11.4
314(b)................................................................................  Inapplicable
314(c)................................................................................  11.5
314(d)................................................................................  Inapplicable
314(e)................................................................................  1.2
314(f)................................................................................  11.1
315(a)................................................................................  7.1(a)
315(b)................................................................................  7.2
315(c)................................................................................  7.1(h)
315(d)(1).............................................................................  7.1(a) and (b)
315(d)(2).............................................................................  7.1(b)
315(d)(3).............................................................................  11.9
316(a)(1)(A)..........................................................................  11.9
316(a)(1)(B)..........................................................................  11.6
316(b)................................................................................  6.1
316(c)................................................................................  11.2
317(a)................................................................................  Inapplicable
317(b)................................................................................  Inapplicable
318(a)................................................................................  11.1(b)
</TABLE>

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*        This Cross-Reference Table does not constitute part of the Purchase
         Contract Agreement and shall not affect the interpretation of any of
         its terms or provisions.

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                                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                              PAGE
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<S>                                                                                                           <C>
                        ARTICLE I. Definitions and Other Provisions of General Application

SECTION 1.1    Definitions................................................................................      1
SECTION 1.2    Compliance Certificates and Opinions.......................................................     13
SECTION 1.3    Form of Documents Delivered to Agent.......................................................     13
SECTION 1.4    Acts of Holders; Record Dates..............................................................     14
SECTION 1.5    Notices....................................................................................     15
SECTION 1.6    Notice to Holders; Waiver..................................................................     16
SECTION 1.7    Effect of Headings and Table of Contents...................................................     16
SECTION 1.8    Successors and Assigns.....................................................................     17
SECTION 1.9    Separability Clause........................................................................     17
SECTION 1.10   Benefits of Agreement......................................................................     17
SECTION 1.11   Governing Law..............................................................................     17
SECTION 1.12   Legal Holidays.............................................................................     17
SECTION 1.13   Counterparts...............................................................................     18
SECTION 1.14   Inspection of Agreement....................................................................     18

                                          ARTICLE II. Certificate Forms

SECTION 2.1    Forms of Certificates Generally............................................................     18
SECTION 2.2    Form of Agent's Certificate of Authentication..............................................     19

                                              ARTICLE III. The Units

SECTION 3.1    Title and Terms; Denominations.............................................................     19
SECTION 3.2    Rights and Obligations Evidenced by the Certificates.......................................     19
SECTION 3.3    Execution, Authentication, Delivery and Dating.............................................     20
SECTION 3.4    Temporary Certificates.....................................................................     21
SECTION 3.5    Registration; Registration of Transfer and Exchange........................................     21
SECTION 3.6    Book-Entry Interests.......................................................................     23
SECTION 3.7    Notices to Holders.........................................................................     23
SECTION 3.8    Appointment of Successor Clearing Agency...................................................     24
SECTION 3.9    Definitive Certificates....................................................................     24
SECTION 3.10   Mutilated, Destroyed, Lost and Stolen Certificates.........................................     24
SECTION 3.11   Persons Deemed Owners......................................................................     25
SECTION 3.12   Cancellation...............................................................................     26
SECTION 3.13   Establishment of Stripped Units............................................................     26
SECTION 3.14   Re-establishment of Normal Units...........................................................     28
SECTION 3.15   Transfer of Collateral Upon Occurrence of Termination Event................................     29
SECTION 3.16   No Consent to Assumption...................................................................     29
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                                              ARTICLE IV. The Notes

SECTION 4.1    Payment of Interest; Rights to Interest Payments Preserved; Notice.........................     30
SECTION 4.2    Notice and Voting..........................................................................     30
SECTION 4.3    Tax Event Redemption.......................................................................     31
SECTION 4.4    Consent to Treatment for Tax Purposes......................................................     32

                                ARTICLE V. The Purchase Contracts; the Remarketing

SECTION 5.1    Purchase of Shares of Common Stock.........................................................     32
SECTION 5.2    Contract Adjustment Payments...............................................................     34
SECTION 5.3    Deferral of Contract Adjustment Payments...................................................     35
SECTION 5.4    Payment of Purchase Price; Remarketing.....................................................     36
SECTION 5.5    Issuance of Shares of Common Stock.........................................................     40
SECTION 5.6    Adjustment of Settlement Rate..............................................................     41
SECTION 5.7    Notice of Adjustments and Certain Other Events.............................................     46
SECTION 5.8    Termination Event; Notice..................................................................     47
SECTION 5.9    Early Settlement...........................................................................     47
SECTION 5.10   Early Settlement upon Cash Merger..........................................................     49
SECTION 5.11   Charges and Taxes..........................................................................     50
SECTION 5.12   No Fractional Shares.......................................................................     50

                                               ARTICLE VI. Remedies

SECTION 6.1    Unconditional Right of Holders to Receive Purchase Contract Adjustment
               Payments and Purchase Common Stock.........................................................     51
SECTION 6.2    Restoration of Rights and Remedies.........................................................     51
SECTION 6.3    Rights and Remedies Cumulative.............................................................     51
SECTION 6.4    Delay or Omission Not Waiver...............................................................     52
SECTION 6.5    Undertaking for Costs......................................................................     52
SECTION 6.6    Waiver of Stay or Extension Laws...........................................................     52

                                              ARTICLE VII. The Agent

SECTION 7.1    Certain Duties and Responsibilities........................................................     52
SECTION 7.2    Notice of Default..........................................................................     53
SECTION 7.3    Certain Rights of Agent....................................................................     54
SECTION 7.4    Not Responsible for Recitals, Etc. ........................................................     55
SECTION 7.5    May Hold Units and Other Dealings..........................................................     55
SECTION 7.6    Money Held In Custody......................................................................     55
SECTION 7.7    Compensation and Reimbursement.............................................................     55
SECTION 7.8    Corporate Agent Required; Eligibility......................................................     56
SECTION 7.9    Resignation and Removal; Appointment of Successor..........................................     57
SECTION 7.10   Acceptance of Appointment by Successor.....................................................     58
SECTION 7.11   Merger, Conversion, Consolidation or Succession to Business................................     58
SECTION 7.12   Preservation of Information; Communications to Holders.....................................     58
</TABLE>

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<S>                                                                                                            <C>
SECTION 7.13   No Obligations of Agent....................................................................     59
SECTION 7.14   Tax Compliance.............................................................................     59

                                      ARTICLE VIII. Supplemental Agreements

SECTION 8.1    Supplemental Agreements without Consent of Holders.........................................     59
SECTION 8.2    Supplemental Agreements with Consent of Holders............................................     60
SECTION 8.3    Execution of Supplemental Agreements.......................................................     61
SECTION 8.4    Effect of Supplemental Agreements..........................................................     61
SECTION 8.5    Reference to Supplemental Agreements.......................................................     61

                              ARTICLE IX. Consolidation, Merger, Sale or Conveyance

SECTION 9.1    Covenant Not to Merge, Consolidate, Sell or Convey Property Except Under
               Certain Conditions.........................................................................     62
SECTION 9.2    Rights and Duties of Successor Entity......................................................     62
SECTION 9.3    Opinion of Counsel Given to Agent..........................................................     63

                                               ARTICLE X. Covenants

SECTION 10.1   Performance Under Purchase Contracts.......................................................     63
SECTION 10.2   Maintenance of Office or Agency............................................................     63
SECTION 10.3   Company to Reserve Common Stock............................................................     63
SECTION 10.4   Covenants as to Common Stock...............................................................     64

                                         ARTICLE XI. Trust Indenture Act

SECTION 11.1   Trust Indenture Act; Application...........................................................     64
SECTION 11.2   Lists of Holders of Securities.............................................................     64
SECTION 11.3   Reports by the Agent.......................................................................     64
SECTION 11.4   Periodic Reports to Agent..................................................................     65
SECTION 11.5   Evidence of Compliance with Conditions Precedent...........................................     65
SECTION 11.6   Defaults; Waiver...........................................................................     65
SECTION 11.7   Agent's Knowledge of Defaults..............................................................     65
SECTION 11.8   Conflicting Interests......................................................................     65
SECTION 11.9   Direction of Agent.........................................................................     65
</TABLE>

EXHIBIT A    Form of Normal Units Certificate

EXHIBIT B    Form of Stripped Units Certificate

EXHIBIT C    Instruction from Purchase Contract Agent to Collateral Agent

EXHIBIT D    Instruction to Purchase Contract Agent

EXHIBIT E    Notice to Settle by Separate Cash

                                      iii
<PAGE>

         PURCHASE CONTRACT AGREEMENT, dated as of _______________, between
Pinnacle West Capital Corporation, an Arizona corporation (the "Company"), and
The Bank of New York, a banking corporation of the State of New York, acting as
purchase contract agent, attorney-in-fact and trustee for the Holders of Units
from time to time (in any one or more of such capacities, the "Agent").

                                    RECITALS

         The Company has duly authorized the execution and delivery of this
Agreement and the Certificates evidencing the Units.

         All things necessary to make the Purchase Contracts, when the
Certificates are executed by the Company and authenticated, executed on behalf
of the Holders and delivered by the Agent, as provided in this Agreement, the
valid obligations of the Company and the Holders, and to constitute this
Agreement a valid agreement of the Company, in accordance with its terms, have
been done.

                                   WITNESSETH:

         For and in consideration of the premises and the purchase of the Units
by the Holders thereof, it is mutually agreed as follows:

                                   ARTICLE I.

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 1.1 DEFINITIONS.

         For all purposes of this Agreement, except as otherwise expressly
provided or unless the context otherwise requires:

         (a) the terms defined in this Article have the meanings assigned to
them in this Article and include the plural as well as the singular, and nouns
and pronouns of the masculine gender include the feminine and neuter genders;

         (b) all accounting terms not otherwise defined herein have the meanings
assigned to them in accordance with generally accepted accounting principles in
the United States; and

         (c) the words "HEREIN," "HEREOF" and "HEREUNDER" and other words of
similar import refer to this Agreement as a whole and not to any particular
Article, Section or other subdivision;

         "ACT" when used with respect to any Holder, has the meaning specified
in Section 1.4.

         "AFFILIATE" has the same meaning as given to that term in Rule 405 of
the Securities Act or any successor rule thereunder.

<PAGE>

         "AGENT" means the Person named as the "Agent" in the first paragraph of
this instrument until a successor Agent shall have become such pursuant to the
applicable provisions of this Agreement, and thereafter "Agent" shall mean such
Person.

         "AGENT-PURCHASED TREASURY CONSIDERATION" has the meaning specified in
Section 5.4(b)(i).

         "AGREEMENT" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more agreements
supplemental hereto entered into pursuant to the applicable provisions hereof.

         "APPLICABLE MARKET VALUE" has the meaning specified in Section 5.1(c).

         "APPLICABLE OWNERSHIP INTEREST" means, with respect to a Normal Unit
and the U.S. Treasury securities in the Treasury Portfolio, (A) a _____, or
_____%, undivided beneficial ownership interest in a $1,000 principal or
interest amount of a principal or interest strip in a U.S. Treasury security
included in such Treasury Portfolio which matures on or prior to _______________
and (B) for the scheduled interest Payment Date on the Notes that occurs on the
Stock Purchase Date, in the case of a successful remarketing pursuant to the
provisions of Section 5.4, or for each scheduled interest Payment Date on the
Notes that occurs after the Tax Event Redemption Date and on or before the Stock
Purchase Date, in the case of a Tax Event Redemption, a _____% undivided
beneficial ownership interest in a $1,000 principal or interest of a principal
or interest strip in a U.S. Treasury security included in the Treasury Portfolio
that matures on or prior to that interest Payment Date or Dates.

         "APPLICANTS" has the meaning specified in Section 7.12(b).

         "AUTHORIZED OFFICER" means the Chairman of the Board, the President,
any Vice President, the Treasurer, any Assistant Treasurer, or any other officer
or agent of the Company duly authorized by the Board of Directors to act in
respect of matters relating to this Agreement.

         "BANKRUPTCY CODE" means Title 11 of the United States Code, or any
other law of the United States that from time to time provides a uniform system
of bankruptcy laws.

         "BENEFICIAL OWNER" means, with respect to a Book-Entry Interest, a
Person who is the beneficial owner of such Book-Entry Interest as reflected on
the books of the Clearing Agency or on the books of a Person maintaining an
account with such Clearing Agency (directly as a Clearing Agency Participant or
as an indirect participant, in each case in accordance with the rules of such
Clearing Agency).

         "BOARD OF DIRECTORS" means the Board of Directors of the Company or the
Executive Committee of such Board or any other duly authorized committee of such
Board.

         "BOARD RESOLUTION" means (i) a copy of a resolution certified by the
Secretary or the Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, (ii) a copy of a unanimous written consent of the Board of
Directors or (iii) a certificate signed by the authorized officer or officers

                                       2
<PAGE>

to whom the Board of Directors has delegated its authority, and in each case,
delivered to the Agent.

         "BOOK-ENTRY INTEREST" means a beneficial interest in a Global
Certificate, ownership and transfers of which shall be maintained and made
through book entries by a Clearing Agency as described in Section 3.6.

         "BUSINESS DAY" means any day that is not a Saturday, Sunday or day on
which banking institutions and trust companies in the State of New York or at
any other place of payment are authorized or required by law, regulation or
executive order to close.

         "CAPITAL STOCK" means any and all shares, interests, rights to
purchase, warrants, options, participations or other equivalents of or interests
in (however designated, whether voting or non-voting) corporate stock or similar
interests in other types of entities.

         "CASH MERGER" has the meaning set forth in Section 5.10.

         "CASH SETTLEMENT" has the meaning set forth in Section 5.4(a).

         "CERTIFICATE" means a Normal Units Certificate or a Stripped Units
Certificate.

         "CLEARING AGENCY" means an organization registered as a "Clearing
Agency" pursuant to Section 17A of the Exchange Act that is acting as a
depositary for the Units and in whose name, or in the name of a nominee of that
organization, shall be registered a Global Certificate and which shall undertake
to effect book-entry transfers and pledges of the Units.

         "CLEARING AGENCY PARTICIPANT" means a broker, dealer, bank, trust
company, clearing corporation, other financial institution or other Person for
whom from time to time the Clearing Agency effects book-entry transfers and
pledges of securities deposited with the Clearing Agency.

         "CLOSING PRICE" has the meaning specified in Section 5.1(c).

         "COLLATERAL" has the meaning specified in Section 2.1(a)(iii) of the
Pledge Agreement.

         "COLLATERAL AGENT" means _______________, _____  __________, as
Collateral Agent under the Pledge Agreement until a successor Collateral Agent
shall have become such pursuant to the applicable provisions of the Pledge
Agreement, and thereafter "Collateral Agent" shall mean the Person who is then
the Collateral Agent thereunder.

         "COLLATERAL SUBSTITUTION" has the meaning specified in Section 3.13(a).

         "COMMON STOCK" means the common stock, no par value of the Company
including, where applicable, the preferred share purchase rights attached
thereto.

         "COMPANY" means the Person named as the "Company" in the first
paragraph of this instrument until a successor shall have become such pursuant
to the applicable provisions of this Agreement, and thereafter "Company" shall
mean such successor.

                                       3
<PAGE>

         "COMPANY CERTIFICATE" means a certificate signed by an Authorized
Officer and delivered to the Agent.

         "CONSTITUENT PERSON" has the meaning specified in Section 5.6(b).

         "CONTRACT ADJUSTMENT PAYMENTS" means, in the case of Normal Units and
Stripped Units, the amount payable by the Company in respect of each Purchase
Contract constituting a part of such Unit, which amount shall be equal to ____%
per year of the Stated Amount, in each case computed (i) for any full quarterly
period on the basis of a 360-day year of twelve 30-day months and (ii) for any
period shorter than a full quarterly period, on the basis of a 30-day month, and
for periods of less than a month, on the basis of the actual number of days
elapsed per 30-day month, plus any Deferred Contract Adjustment Payments accrued
pursuant to Section 5.3.

         "CORPORATE TRUST OFFICE" means the corporate trust office of the Agent
at which, at any particular time, its corporate trust business shall be
principally administered, which office at the date hereof is located at 700
South Flower Street, Suite 500, Los Angeles, California 90017.

         "COUPON RATE" means the percentage rate per annum at which each Note
will bear interest initially.

         "CURRENT MARKET PRICE" has the meaning specified in Section 5.6(a)(8).

         "CUSTODIAL AGENT" means _______________, a ________________, as
Custodial Agent under the Pledge Agreement until a successor Custodial Agent
shall have become such pursuant to the applicable provisions of the Pledge
Agreement, and thereafter Custodial Agent shall mean the Person who is then the
Custodial Agent thereunder.

         "DEFAULT" means a default by the Company in any of its obligations
under this Agreement.

         "DEFERRED CONTRACT ADJUSTMENT PAYMENTS" has the meaning specified in
Section 5.3(a).

         "DEPOSITARY" means, initially, DTC until another Clearing Agency
becomes its successor.

         "DTC" means The Depository Trust Company, the initial Clearing Agency.

         "EARLY SETTLEMENT" has the meaning specified in Section 5.9(a).

         "EARLY SETTLEMENT AMOUNT" has the meaning specified in Section 5.9(a).

         "EARLY SETTLEMENT DATE" has the meaning specified in Section 5.9(a).

         "EARLY SETTLEMENT RATE" has the meaning specified in Section 5.9(b).

                                       4
<PAGE>

         "EXCHANGE ACT" means the Securities Exchange Act of 1934 and any
statute successor thereto, in each case as amended from time to time, and the
rules and regulations promulgated thereunder.

         "EXPIRATION DATE" has the meaning specified in Section 1.4(f).

         "EXPIRATION TIME" has the meaning specified in Section 5.6(a)(6).

         "FAILED REMARKETING" has the meaning specified in Section 5.4(b)(ii).

         "FAIR MARKET VALUE" with respect to securities distributed in a
Spin-Off means (a) in the case of any Spin-Off that is effected simultaneously
with an Initial Public Offering of such securities, the initial public offering
price of those securities, and (b) in the case of any other Spin-Off, (i) the
average of the Sale Price of those securities over the first ten Trading Days
after the effective date of such Spin-Off or (ii) if the Sale Price is required
to be defined without regard to the price on any Trading Days, the Sale Price as
of the effective date of such Spin-Off.

         "GLOBAL CERTIFICATE" means a Certificate that evidences all or part of
the Units and is registered in the name of the Depositary or a nominee thereof.

         "HOLDER" means the Person in whose name the Unit evidenced by a Normal
Units Certificate and/or a Stripped Units Certificate is registered in the
related Normal Units Register and/or the Stripped Units Register, as the case
may be.

         "INDENTURE" means the Indenture, dated as of December 1, 2000, between
the Company and the Indenture Trustee pursuant to which the Notes are to be
issued, as originally executed and delivered and as it may from time to time be
supplemented or amended by one or more indentures supplemental thereto entered
into pursuant to the applicable provisions thereof and shall include the terms
of a particular series established as contemplated by Section 2.05(c) thereof.

         "INDENTURE TRUSTEE" means The Bank of new York, a banking corporation
of the State of New York, as trustee under the Indenture, or any successor
thereto.

         "INITIAL PUBLIC OFFERING" with respect to a Spin-Off means the first
time securities of the same class or type as the securities being distributed in
such Spin-Off are bona fide offered to the public for cash.

         "ISSUER ORDER" or "ISSUER REQUEST" means a written order or request
signed in the name of the Company by an Authorized Officer and delivered to the
Agent.

         "LAST FAILED REMARKETING" has the meaning specified in Section
5.4(b)(ii).

         "MERGER EARLY SETTLEMENT" has the meaning specified in Section 5.10(a).

         "MERGER EARLY SETTLEMENT AMOUNT" has the meaning specified in Section
5.10(b).

         "MERGER EARLY SETTLEMENT DATE" has the meaning specified in Section
5.10(a).

                                       5
<PAGE>

         "NON-ELECTING SHARE" has the meaning specified in Section 5.6(b).

         "NORMAL UNIT" means the collective rights and obligations of a Holder
of a Normal Units Certificate in respect of a Note or the appropriate Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, subject in each case to the Pledge thereof, and the related
Purchase Contract.

         "NORMAL UNITS CERTIFICATE" means a certificate evidencing the rights
and obligations of a Holder in respect of the number of Normal Units specified
on such certificate, substantially in the form of Exhibit A hereto.

         "NORMAL UNITS REGISTER" and "NORMAL UNITS REGISTRAR" have the
respective meanings specified in Section 3.5(a).

         "NOTES" means the series of debt securities of the Company designated
the "Notes due _______________", to be issued under the Indenture.

         "NYSE" has the meaning specified in Section 5.1(c).

         "OPINION OF COUNSEL" means an opinion in writing signed by legal
counsel, who may be an employee of or counsel to the Company or an Affiliate and
who shall be reasonably acceptable to the Agent.

         "OPT-OUT TREASURY CONSIDERATION" has meaning specified in Section
5.4(b)(iv).

         "OUTSTANDING UNITS" means, as of the date of determination, all Normal
Units or Stripped Units evidenced by Certificates theretofore authenticated,
executed and delivered under this Agreement, except:

                  (i) If a Termination Event has occurred, (A) Stripped Units
         and (B) Normal Units for which the related Note or the appropriate
         Treasury Consideration or Applicable Ownership Interest in the Treasury
         Portfolio, as the case may be, has been theretofore deposited with the
         Agent in trust for the Holders of such Normal Units;

                  (ii) Normal Units and Stripped Units evidenced by Certificates
         theretofore cancelled by the Agent or delivered to the Agent for
         cancellation or deemed cancelled pursuant to the provisions of this
         Agreement; and

                  (iii) Normal Units and Stripped Units evidenced by
         Certificates in exchange for or in lieu of which other Certificates
         have been authenticated, executed on behalf of the Holder and delivered
         pursuant to this Agreement, other than any such Certificate in respect
         of which there shall have been presented to the Agent proof
         satisfactory to it that such Certificate is held by a bona fide
         purchaser in whose hands the Normal Units or Stripped Units evidenced
         by such Certificate are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
number of the Normal Units or Stripped Units have given any request, demand,
authorization, direction, notice, consent or waiver hereunder, Normal Units or
Stripped Units owned by the Company or any

                                       6
<PAGE>

Affiliate of the Company shall be disregarded and deemed not to be outstanding,
except that, in determining whether the Agent shall be protected in relying upon
any such request, demand, authorization, direction, notice, consent or waiver,
only Normal Units or Stripped Units which a Responsible Officer of the Agent
knows to be so owned shall be so disregarded. Normal Units or Stripped Units so
owned which have been pledged in good faith may be regarded as Outstanding Units
if the pledgee establishes to the satisfaction of the Agent the pledgee's right
so to act with respect to such Normal Units or Stripped Units and that the
pledgee is not the Company or any Affiliate of the Company.

         "PAYMENT DATE" means each ______, ______, ______ and ______, commencing
_______________.

         "PERSON" means a legal person, including any individual, corporation,
limited liability company, partnership, joint venture, association, joint-stock
company, trust, unincorporated organization or government or any agency or
political subdivision thereof or any other entity of whatever nature.

         "PLEDGE" means the pledge under the Pledge Agreement of the Notes, the
Treasury Securities or the appropriate Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio, in each case constituting a part
of the Units, property, cash, securities, financial assets and security
entitlements of the Collateral Account (as defined in the Pledge Agreement) and
any Proceeds (as defined in the Pledge Agreement) of any of the foregoing.

         "PLEDGE AGREEMENT" means the Pledge Agreement, dated as of the date
hereof, by and among the Company, the Collateral Agent, the Custodial Agent, the
Securities Intermediary and the Agent, on its own behalf and as attorney-in-fact
for the Holders from time to time of the Units.

         "PLEDGED APPLICABLE OWNERSHIP INTEREST IN THE TREASURY PORTFOLIO" has
the meaning set forth in Section 2.1(c) of the Pledge Agreement.

         "PLEDGED NOTES" has the meaning set forth in Section 2.1(c) of the
Pledge Agreement.

         "PLEDGED TREASURY CONSIDERATION" has the meaning set forth in Section
2.1(c) of the Pledge Agreement.

         "PLEDGED TREASURY SECURITIES" has the meaning set forth in Section
2.1(c) of the Pledge Agreement.

         "PREDECESSOR CERTIFICATE" means a Predecessor Normal Units Certificate
or a Predecessor Stripped Units Certificate.

         "PREDECESSOR NORMAL UNITS CERTIFICATE" of any particular Normal Units
Certificate means every previous Normal Units Certificate evidencing all or a
portion of the rights and obligations of the Company and the Holder under the
Normal Units evidenced thereby; and, for the purposes of this definition, any
Normal Units Certificate authenticated and delivered under Section 3.10 in
exchange for or in lieu of a mutilated, destroyed, lost or stolen Normal Units

                                       7
<PAGE>

Certificate shall be deemed to evidence the same rights and obligations of the
Company and the Holder as the mutilated, destroyed, lost or stolen Normal Units
Certificate.

         "PREDECESSOR STRIPPED UNITS CERTIFICATE" of any particular Stripped
Units Certificate means every previous Stripped Units Certificate evidencing all
or a portion of the rights and obligations of the Company and the Holder under
the Stripped Units evidenced thereby; and, for the purposes of this definition,
any Stripped Units Certificate authenticated and delivered under Section 3.10 in
exchange for or in lieu of a mutilated, destroyed, lost or stolen Stripped Units
Certificate shall be deemed to evidence the same rights and obligations of the
Company and the Holder as the mutilated, destroyed, lost or stolen Stripped
Units Certificate.

         "PURCHASE CONTRACT," when used with respect to any Unit, means the
contract forming a part of such Unit and obligating the Company to sell and the
Holder of such Unit to purchase Common Stock on the terms and subject to the
conditions set forth in Article V.

         "PURCHASE CONTRACT SETTLEMENT FUND" has the meaning specified in
Section 5.5.

         "PURCHASE PRICE" has the meaning specified in Section 5.1(a).

         "PURCHASED SHARES" has the meaning specified in Section 5.6(a)(6).

         "QUOTATION AGENT" means each of _______________ and _______________ or
any of their respective successors or any other primary U.S. government
securities dealer in New York City selected by the Company.

         "RECORD DATE" for the payment of distributions payable on any Payment
Date means, as to any Global Certificate, the Business Day next preceding such
Payment Date, and as to any other Certificate, the ____ calendar day preceding
such Payment Date.

         "REDEMPTION AMOUNT" means, for each Note, the product of (i) the
principal amount of such Note and (ii) a fraction whose numerator is the
applicable Treasury Portfolio Purchase Price and whose denominator is the
applicable Tax Event Redemption Principal Amount.

         "REDEMPTION PRICE" means the amount per Note equal to the Redemption
Amount plus any accrued and unpaid interest on such Note to the date of
redemption.

         "REGISTER" means the Normal Units Register and the Stripped Units
Register, as applicable.

         "REGISTRAR" means the Normal Units Registrar and the Stripped Units
Registrar, as applicable.

         "REMARKETING AGENT" has the meaning specified in Section 5.4(b)(i).

         "REMARKETING AGREEMENT" means the Remarketing Agreement dated as of
_______________, by and among the Company, the Remarketing Agent and the Agent.

         "REMARKETING DATE" means the third business day preceding ____________.

                                       8
<PAGE>

         "REMARKETING FEE" has the meaning specified in Section 5.4(b)(i).

         "REMARKETING PERIOD" means either (i) the three Business Day period
beginning on the Remarketing Date and ending after the two immediately following
Business Days; (ii) the three Business Day period immediately preceding
_______________; or (iii) the third Business Day immediately preceding
_______________.

         "REMARKETING RATE" means the percentage rate per year at which each
Note will bear interest after a successful remarketing of the Notes pursuant to
the provisions of Section 5.4.

         "REMARKETING VALUE" means the sum of

                  (i) the value at the Remarketing Date or any Subsequent
         Remarketing Date, as the case may be, of U.S. Treasury securities that
         will pay, on or prior to the Stock Purchase Date, an amount of cash
         equal to the aggregate interest payments that are scheduled to be
         payable on that date on the Notes which are included in Normal Units
         and are participating in the remarketing, assuming for that purpose,
         even if not true, that the interest rate on the Notes is equal to the
         Coupon Rate, and

                  (ii) the value at the Remarketing Date or any Subsequent
         Remarketing Date, as the case may be, of U.S. Treasury securities that
         will pay, on or prior to the Stock Purchase Date, an amount of cash
         equal to the Stated Amount of such Notes that are included in Normal
         Units and which are participating in the remarketing,

provided that for purposes of clauses (i) and (ii) above, the Remarketing Value
shall be calculated on the assumptions that (x) the U.S. Treasury securities are
highly liquid and mature on or within 35 days prior to the Stock Purchase Date,
as determined in good faith by the Remarketing Agent in a manner intended to
minimize the cash value of the U.S. Treasury securities, and (y) the U.S.
Treasury securities are valued based on the ask-side price of the U.S. Treasury
securities at a time between 9:00 a.m. and 11:00 a.m., New York City time,
selected by the Remarketing Agent, on the Remarketing Date or any Subsequent
Remarketing Date, as the case may be, as determined on a third-day settlement
basis by a reasonable and customary means selected in good faith by the
Remarketing Agent, plus accrued interest to that date.

         "REORGANIZATION EVENT" has the meaning specified in Section 5.6(b).

         "RESPONSIBLE OFFICER" when used with respect to the Agent, means any
officer within the corporate trust department of the Agent (or any successor of
the Agent), including any Vice President, any assistant Vice President, any
assistant treasurer, any trust officer or any other officer of the Agent who
customarily performs functions similar to those performed by the Persons who at
the time shall be such officers, respectively, or to whom any corporate trust
matter is referred because of such person's knowledge of and familiarity with
the particular subject.

         "SALE PRICE" of any securities distributed in a Spin-Off on any Trading
Day means the closing sale price per share (or if no closing sale price is
reported, the average of the bid and ask prices or, if more than one in either
case, the average of the average bid and the average asked prices) on such
Trading Day as reported in composite transactions for the principal U.S.

                                       9
<PAGE>

securities exchange on which such securities are traded or, if such securities
are not listed on a U.S. national or regional securities exchange, as reported
by The Nasdaq Stock Market, or if such securities are not so reported, the last
quoted bid price for such securities in the over-the-counter market as reported
by the National Quotation Bureau or similar organization, or, if such bid price
is not available, the market value of such securities on such date as determined
by a nationally recognized independent investment banking firm retained by the
Company for this purpose.

         "SECURITIES ACT" means the Securities Act of 1933, and any statute
successor thereto, in each case as amended from time to time, and the rules and
regulations promulgated thereunder.

         "SECURITIES INTERMEDIARY" means _______________, _______________, in
its capacity as Securities Intermediary under the Pledge Agreement, together
with its successors in such capacity.

         "SENIOR INDEBTEDNESS" means indebtedness of any kind of the Company
unless the instrument under which such indebtedness is incurred expressly
provides that it is in parity or subordinate in right of payment to the Contract
Adjustment Payments.

         "SEPARATE NOTES" has the meaning set forth in the Pledge Agreement.

         "SETTLEMENT DATE" means any Early Settlement Date or Merger Early
Settlement Date or the Stock Purchase Date.

         "SETTLEMENT RATE" has the meaning specified in Section 5.1(a).

         "SPIN-OFF" means a dividend or other distribution on the Common Stock
of shares of Capital Stock of any class or series, or similar equity interests,
of or relating to a subsidiary or other business unit of the Company.

         "STATED AMOUNT" means, with respect to any one Note, Normal Unit or
Stripped Unit, _____.

         "STOCK PURCHASE DATE" means _______________.

         "STRIPPED UNIT" means the collective rights and obligations of a Holder
of a Stripped Units Certificate in respect of a _____ undivided beneficial
interest in a Treasury Security, subject to the Pledge thereof, and the related
Purchase Contract.

         "STRIPPED UNITS CERTIFICATE" means a certificate evidencing the rights
and obligations of a Holder in respect of the number of Stripped Units specified
on such certificate, substantially in the form of Exhibit B hereto.

         "STRIPPED UNITS REGISTER" and "STRIPPED UNITS REGISTRAR" have the
respective meanings specified in Section 3.5(a).

         "SUBSEQUENT REMARKETING DATE" means, provided there has been one or
more Failed Remarketings, the date on which the Remarketing Agent has
consummated a successful

                                       10
<PAGE>

remarketing in accordance with Section 5.4 hereof, such date to be no later than
the third Business Day immediately preceding the Stock Purchase Date.

         "TAX EVENT" means the receipt by the Company of an opinion of a
nationally recognized tax counsel experienced in such matters, which may be
_______________, to the effect that there is more than an insubstantial risk
that interest payable by the Company on the Notes on the next Payment Date will
not be deductible, in whole or in part, by the Company for United States federal
income tax purposes as a result of (a) any amendment to, or change (including
any announced proposed change) in, the laws (or any regulations thereunder) of
the United States or any political subdivision or taxing authority thereof or
therein affecting taxation, (b) any amendment to or change in an official
interpretation or application of such laws or regulations by any legislative
body, court, governmental agency or regulatory authority or (c) any official
interpretation or pronouncement that provides for a position with respect to
such laws or regulations that differs from the generally accepted position on
_______________, which amendment, change or proposed change is effective or
which interpretation or pronouncement is announced on or after _______________.

         "TAX EVENT REDEMPTION" means, if a Tax Event shall occur and be
continuing, the redemption of the Notes, at the option of the Company, in whole
but not in part, on not less than 30 days nor more than 60 days prior written
notice.

         "TAX EVENT REDEMPTION DATE" means the date on which a Tax Event
Redemption is to occur.

         "TAX EVENT REDEMPTION PRINCIPAL AMOUNT" means (i) in the case of a Tax
Event Redemption Date occurring prior to a successful remarketing of the Notes
pursuant to the provisions of Section 5.4, the aggregate principal amount of
Notes included in Normal Units on such date, and (ii) in the case of a Tax Event
Redemption Date occurring after a successful remarketing of the Notes pursuant
to the provisions of Section 5.4, the aggregate principal amount of the Notes.

         "TERMINATION DATE" means the date, if any, on which a Termination Event
occurs.

         "TERMINATION EVENT" means the occurrence of any of the following
events:

                  (i) at any time on or prior to the Stock Purchase Date, a
         judgment, decree or court order shall have been entered granting relief
         under the Bankruptcy Code or any other similar federal or state law,
         adjudicating the Company to be insolvent, or approving as properly
         filed a petition seeking reorganization or liquidation of the Company,
         and, unless such judgment, decree or order shall have been entered
         within 60 days prior to the Stock Purchase Date, such decree or order
         shall have continued undischarged and unstayed for a period of 60 days;

                  (ii) at any time on or prior to the Stock Purchase Date, a
         judgment, decree or court order for the appointment of a receiver or
         liquidator or trustee or assignee in bankruptcy or insolvency of the
         Company or of its property, or for the winding up or liquidation of its
         affairs, shall have been entered, and, unless such judgment, decree or
         order shall have been entered within 60 days prior to the Stock
         Purchase Date, such

                                       11
<PAGE>

         judgment, decree or order shall have continued undischarged and
         unstayed for a period of 60 days; or

                  (iii) at any time on or prior to the Stock Purchase Date, the
         Company shall file a petition for relief under the Bankruptcy Code or
         any other similar federal or state law, or shall consent to the filing
         of a bankruptcy proceeding against it, or shall file a petition or
         answer or consent seeking reorganization or liquidation under the
         Bankruptcy Code or any other similar federal or state law, or shall
         consent to the filing of any such petition, or shall consent to the
         appointment of a receiver or liquidator or trustee or assignee in
         bankruptcy or insolvency of it or of its property, or shall make an
         assignment for the benefit of creditors, or shall admit in writing its
         inability to pay its debts generally as they become due.

         "THRESHOLD APPRECIATION PRICE" has the meaning specified in Section
5.1(a)(i).

         "TIA" means the Trust Indenture Act of 1939, and any statute successor
thereto, in each case as amended from time to time, and the rules and
regulations promulgated thereunder.

         "TRADING DAY" has the meaning specified in Section 5.1(c).

         "TREASURY CONSIDERATION" means the Agent-purchased Treasury
Consideration or the Opt-out Treasury Consideration.

         "TREASURY PORTFOLIO" means: (i) if a Tax Event Redemption occurs prior
to a successful remarketing of the Notes pursuant to the provisions of Section
5.4, a portfolio of zero-coupon U.S. Treasury securities consisting of principal
or interest strips of U.S. Treasury securities that mature on or prior to the
Stock Purchase Date in an aggregate amount equal to the applicable Tax Event
Redemption Principal Amount and with respect to each scheduled interest Payment
Date on the Notes that occurs after the Tax Event Redemption Date and on or
before the Stock Purchase Date, interest or principal strips of U.S. Treasury
securities that mature on or prior to such interest Payment Date in an aggregate
amount equal to the aggregate interest payment that would be due on the
applicable Tax Event Redemption Principal Amount on such date if the interest
rate of the Notes were not reset on the applicable Remarketing Date, and (ii)
solely for purposes of determining the Treasury Portfolio Purchase Price in the
case of a Tax Event Redemption Date occurring after a successful remarketing of
the Notes pursuant to the provisions of Section 5.4, a portfolio of zero-coupon
U.S. Treasury securities consisting of principal or interest strips of U.S.
Treasury securities that mature on or prior to _______________ in an aggregate
amount equal to the applicable Tax Event Redemption Principal Amount and with
respect to each scheduled interest Payment Date on the Notes that occurs after
the Tax Event Redemption Date and on or before _______________, interest or
principal strips of U.S. Treasury securities that mature on or prior to such
interest Payment Date in an aggregate amount equal to the aggregate interest
payment that would be due on the applicable Tax Event Redemption Principal
Amount of the Notes outstanding on the Tax Event Redemption Date.

         "TREASURY PORTFOLIO PURCHASE PRICE" means the lowest aggregate price
quoted by a primary U.S. government securities dealer in New York City to the
Quotation Agent on the third

                                       12
<PAGE>

Business Day immediately preceding the Tax Event Redemption Date for the
purchase of the Treasury Portfolio for settlement on the Tax Event Redemption
Date.

         "TREASURY SECURITY" means a zero-coupon U.S. Treasury security (CUSIP
Number __________) maturing on the Stock Purchase Date that will pay $1,000 on
such maturity date.

         "UNDERWRITING AGREEMENT" means the Underwriting Agreement relating to
the Units dated _______________ among the Company and the underwriters named
therein.

         "UNIT" means a Normal Unit or a Stripped Unit.

         "VICE-PRESIDENT" means any vice-president, whether or not designated by
a number or a word or words added before or after the title "Vice-President."

SECTION 1.2 COMPLIANCE CERTIFICATES AND OPINIONS.

         Except as otherwise expressly provided by this Agreement, upon any
application or request by the Company to the Agent to take any action under any
provision of this Agreement, the Company shall furnish to the Agent a Company
Certificate stating that all conditions precedent, if any, provided for in this
Agreement relating to the proposed action have been complied with and, if
requested by the Agent, an Opinion of Counsel stating that, in the opinion of
such counsel, all such conditions precedent, if any, have been complied with,
except that in the case of any such application or request as to which the
furnishing of such documents is specifically required by any provision of this
Agreement relating to such particular application or request, no additional
certificate or opinion need be furnished.

         Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Agreement shall include:

         (a) a statement that each individual signing such certificate or
opinion has read such covenant or condition and the definitions herein relating
thereto;

         (b) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based;

         (c) a statement that, in the opinion of each such individual, he or she
has made such examination or investigation as is necessary to enable such
individual to express an informed opinion as to whether or not such covenant or
condition has been complied with; and

         (d) a statement as to whether, in the opinion of such individual, such
condition or covenant has been complied with.

SECTION 1.3 FORM OF DOCUMENTS DELIVERED TO AGENT.

         (a) In any case where several matters are required to be certified by,
or covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters

                                       13
<PAGE>

and one or more other such Persons as to other matters, and any such Person may
certify or give an opinion as to such matters in one or several documents.

         (b) Any certificate or opinion of an officer of the Company may be
based, insofar as it relates to legal matters, upon a certificate or opinion of,
or representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous. Any such certificate or Opinion of Counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care should
know, that the certificate or opinion or representations with respect to such
matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Agreement, they may, but need not, be consolidated and
form one instrument.

SECTION 1.4. ACTS OF HOLDERS; RECORD DATES.

         (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Agreement to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing; and, except as herein otherwise expressly provided, such
action shall become effective when such instrument or instruments are delivered
to the Agent and, where it is hereby expressly required, to the Company. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders signing
such instrument or instruments. Proof of execution of any such instrument or of
a writing appointing any such agent shall be sufficient for any purpose of this
Agreement and (subject to Section 7.1) conclusive in favor of the Agent and the
Company, if made in the manner provided in this Section.

         (b) The fact and date of the execution by any Person of any such
instrument or writing may be proved in any manner which the Agent deems
sufficient.

         (c) The ownership of Units shall be proved by the Normal Units Register
or the Stripped Units Register, as the case may be.

         (d) Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Certificate shall bind every future
Holder of the same Certificate and the Holder of every Certificate issued upon
the registration of transfer thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Agent or the
Company in reliance thereon, whether or not notation of such action is made upon
such Certificate.

         (e) The Company may set any day as a record date for the purpose of
determining the Holders of Outstanding Units entitled to give, make or take any
request, demand, authorization, direction, notice, consent, waiver or other
action provided or permitted by this Agreement to be

                                       14
<PAGE>

given, made or taken by Holders of Units. If any record date is set pursuant to
this paragraph, the Holders of the Outstanding Normal Units and the Outstanding
Stripped Units, as the case may be, on such record date, and no other Holders,
shall be entitled to take the relevant action with respect to the Normal Units
or the Stripped Units, as the case may be, whether or not such Holders remain
Holders after such record date; provided that no such action shall be effective
hereunder unless taken on or prior to the applicable Expiration Date by Holders
of the requisite number of Outstanding Units on such record date. Nothing in
this paragraph shall be construed to prevent the Company from setting a new
record date for any action for which a record date has previously been set
pursuant to this paragraph (whereupon the record date previously set shall
automatically and with no action by any Person be cancelled and of no effect),
and nothing in this paragraph shall be construed to render ineffective any
action taken by Holders of the requisite number of Outstanding Units on the date
such action is taken. Promptly after any record date is set pursuant to this
paragraph, the Company, at its own expense, shall cause notice of such record
date, the proposed action by Holders and the applicable Expiration Date to be
given to the Agent in writing and to each Holder of Units in the manner set
forth in Section 1.6.

         (f) With respect to any record date set pursuant to this Section, the
Company may designate any date as the "Expiration Date" and from time to time
may change the Expiration Date to any earlier or later day; provided that no
such change shall be effective unless notice of the proposed new Expiration Date
is given to the Agent in writing, and to each Holder of Units in the manner set
forth in Section 1.6, on or prior to the existing Expiration Date. If an
Expiration Date is not designated with respect to any record date set pursuant
to this Section, the Company shall be deemed to have initially designated the
180th day after such record date as the Expiration Date with respect thereto,
subject to its right to change the Expiration Date as provided in this
paragraph. Notwithstanding the foregoing, no Expiration Date shall be later than
the 180th day after the applicable record date.

SECTION 1.5 NOTICES.

         Any request, demand, authorization, direction, notice, consent, waiver
or Act of Holders or other document provided or permitted by this Agreement to
be made upon, given or furnished to, or filed with:

         (a) the Agent by any Holder or by the Company shall be sufficient for
every purpose hereunder (unless otherwise herein expressly provided) if made,
given, furnished or filed in writing and personally delivered, mailed,
first-class postage prepaid, telecopied or delivered by overnight air courier
guaranteeing next day delivery, to the Agent at _______________,
_______________, _______________, Attention: _______________, telecopy:
_______________ or at any other address furnished in writing by the Agent to the
Holders and the Company; or

         (b) the Company by the Agent or by any Holder shall be sufficient for
every purpose hereunder (unless otherwise herein expressly provided) if made,
given, furnished or filed in writing and personally delivered, mailed,
first-class postage prepaid, telecopied or delivered by overnight air courier
guaranteeing next day delivery, to the Company at Pinnacle West Capital
Corporation, 400 North Fifth Street, Phoenix, Arizona 85004, telecopy: (602)
250-5640,

                                       15
<PAGE>

Attention: Vice President and Treasurer or at any other address furnished in
writing to the Agent by the Company; or

         (c) the Collateral Agent by the Agent, the Company or any Holder shall
be sufficient for every purpose hereunder (unless otherwise herein expressly
provided) if made, given, furnished or filed in writing and personally
delivered, mailed, first-class postage prepaid, telecopied or delivered by
overnight air courier guaranteeing next day delivery, addressed to the
Collateral Agent at _______________, c/o _______________, _______________,
_______________, Attention: _______________, telecopy: _______________ or at any
other address furnished in writing by the Collateral Agent to the Agent, the
Company and the Holders; or

         (d) the Indenture Trustee by the Company shall be sufficient for every
purpose hereunder (unless otherwise herein expressly provided) if made, given,
furnished or filed in writing and personally delivered, mailed, first-class
postage prepaid, telecopied or delivered by overnight air courier guaranteeing
next day delivery, addressed to the Indenture Trustee at 700 South Flower
Street, Suite 500, Los Angeles, California 90017, Attention: Corporate Trust
Administration, telecopy: _______________ or at any other address furnished in
writing by the Trustee to the Company.

SECTION 1.6 NOTICE TO HOLDERS; WAIVER.

         (a) Where this Agreement provides for notice to Holders of any event,
such notice shall be sufficiently given (unless otherwise herein expressly
provided) if in writing and mailed, first-class postage prepaid, to each Holder
affected by such event, at its address as it appears in the applicable Register,
not later than the latest date, and not earlier than the earliest date,
prescribed for the giving of such notice. In any case where notice to Holders is
given by mail, neither the failure to mail such notice nor any defect in any
notice so mailed to any particular Holder shall affect the sufficiency of such
notice with respect to other Holders. Where this Agreement provides for notice
in any manner, such notice may be waived in writing by the Person entitled to
receive such notice, either before or after the event, and such waiver shall be
the equivalent of such notice. Waivers of notice by Holders shall be filed with
the Agent, but such filing shall not be a condition precedent to the validity of
any action taken in reliance upon such waiver.

         (b) In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by mail,
then such notification as shall be made with the approval of the Agent shall
constitute a sufficient notification for every purpose hereunder.

SECTION 1.7 EFFECT OF HEADINGS AND TABLE OF CONTENTS.

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

                                       16
<PAGE>

SECTION 1.8 SUCCESSORS AND ASSIGNS.

         All covenants and agreements in this Agreement by the Company shall
bind its successors and assigns, whether so expressed or not.

SECTION 1.9 SEPARABILITY CLAUSE.

         In case any provision in this Agreement or in the Units shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions hereof and thereof shall not in any way be affected or
impaired thereby.

SECTION 1.10 BENEFITS OF AGREEMENT.

         Nothing in this Agreement or in the Units, express or implied, shall
give to any Person, other than the parties hereto and their successors hereunder
and, to the extent provided hereby, the Holders, any benefits or any legal or
equitable right, remedy or claim under this Agreement. The Holders from time to
time shall be beneficiaries of this Agreement and shall be bound by all of the
terms and conditions hereof and of the Units evidenced by their Certificates by
their acceptance of delivery of such Certificates.

SECTION 1.11 GOVERNING LAW.

         This Agreement and the Units shall be governed by and deemed to be a
contract under, and construed in accordance with, the laws of the State of New
York, without regard to conflicts of laws principles thereof.

SECTION 1.12 LEGAL HOLIDAYS.

         (a) In any case where any Payment Date shall not be a Business Day,
then (notwithstanding any other provision of this Agreement or the Certificates)
payments on the Notes or the payment of Contract Adjustment Payments shall not
be made on such date, but such payments shall be made on the next succeeding
Business Day with the same force and effect as if made on such Payment Date,
provided that no interest or additional payment shall accrue or be payable by
the Company for the period from and after any such Payment Date, except that if
such next succeeding Business Day is in the next succeeding calendar year, such
payment shall be made on the immediately preceding Business Day with the same
force and effect as if made on such Payment Date.

         (b) In any case where the Stock Purchase Date shall not be a Business
Day, then (notwithstanding any other provision of this Agreement or the
Certificates), the Purchase Contracts shall not be performed on such date, but
the Purchase Contracts shall be performed on the next succeeding Business Day
with the same force and effect as if performed on the Stock Purchase Date.

                                       17
<PAGE>

SECTION 1.13 COUNTERPARTS.

         This Agreement may be executed in any number of counterparts by the
parties hereto on separate counterparts, each of which, when so executed and
delivered, shall be deemed an original, but all such counterparts shall together
constitute one and the same instrument.

SECTION 1.14 INSPECTION OF AGREEMENT.

         A copy of this Agreement shall be available at all reasonable times
during normal business hours at the Corporate Trust Office for inspection by any
Holder.

                                   ARTICLE II.

                                CERTIFICATE FORMS

SECTION 2.1 FORMS OF CERTIFICATES GENERALLY.

         (a) The Normal Units Certificates (including the form of Purchase
Contract forming part of the Normal Units evidenced thereby) shall be in
substantially the form set forth in Exhibit A hereto, with such letters, numbers
or other marks of identification or designation and such legends or endorsements
printed, lithographed or engraved thereon as may be required by the rules of any
securities exchange or quotation system on which the Normal Units are listed or
quoted for trading or any depositary therefor, or as may, consistently herewith,
be determined by the officers of the Company executing such Normal Units
Certificates, as evidenced by their execution of the Normal Units Certificates.

         (b) The definitive Normal Units Certificates shall be printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the officers of the Company executing such
Normal Units Certificates, consistent with the provisions of this Agreement, as
evidenced by their execution thereof.

         (c) The Stripped Units Certificates (including the form of Purchase
Contract forming part of the Stripped Units evidenced thereby) shall be in
substantially the form set forth in Exhibit B hereto, with such letters, numbers
or other marks of identification or designation and such legends or endorsements
printed, lithographed or engraved thereon as may be required by the rules of any
securities exchange or the quotation system on which the Stripped Units may be
listed or quoted for trading or any depositary therefor, or as may, consistently
herewith, be determined by the officers of the Company executing such Stripped
Units Certificates, as evidenced by their execution of the Stripped Units
Certificates.

         (d) The definitive Stripped Units Certificates shall be printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the officers of the Company executing such
Stripped Units Certificates, consistent with the provisions of this Agreement,
as evidenced by their execution thereof.

         (e) Every Global Certificate authenticated, executed on behalf of the
Holders and delivered hereunder shall bear a legend in substantially the
following form:

                                       18
<PAGE>

         THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
PURCHASE CONTRACT AGREEMENT (AS HEREINAFTER DEFINED) AND IS REGISTERED IN THE
NAME OF THE CLEARING AGENCY OR A NOMINEE THEREOF. THIS CERTIFICATE MAY NOT BE
EXCHANGED IN WHOLE OR IN PART FOR A CERTIFICATE REGISTERED, AND NO TRANSFER OF
THIS CERTIFICATE IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY
PERSON OTHER THAN SUCH CLEARING AGENCY OR A NOMINEE THEREOF, EXCEPT IN THE
LIMITED CIRCUMSTANCES DESCRIBED IN THE PURCHASE CONTRACT AGREEMENT.

         Unless this Certificate is presented by an authorized representative of
The Depository Trust Company (55 Water Street, New York, New York) to the
Company or its agent for registration of transfer, exchange or payment, and any
Certificate issued is registered in the name of Cede & Co., or such other name
as requested by an authorized representative of The Depository Trust Company,
and any payment hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY A PERSON IS WRONGFUL since the registered owner
hereof, Cede & Co., has an interest herein.

SECTION 2.2 FORM OF AGENT'S CERTIFICATE OF AUTHENTICATION.

         (a) The form of the Agent's certificate of authentication of the Normal
Units shall be in substantially the form set forth on the form of the Normal
Units Certificates.

         (b) The form of the Agent's certificate of authentication of the
Stripped Units shall be in substantially the form set forth on the form of the
Stripped Units Certificates.

                                  ARTICLE III.

                                    THE UNITS

SECTION 3.1 TITLE AND TERMS; DENOMINATIONS.

         (a) The aggregate number of Normal Units and Stripped Units, if any,
evidenced by Certificates authenticated, executed on behalf of the Holders and
delivered hereunder is limited to __________ (__________ if the Underwriters'
(as defined in the Underwriting Agreement) option to purchase additional Normal
Units pursuant to the Underwriting Agreement is exercised in full), except for
Certificates authenticated, executed and delivered upon registration of transfer
of, in exchange for, or in lieu of, other Certificates pursuant to Section 3.4,
3.5, 3.10, 3.13, 3.14, 5.9, 5.10 or 8.5.

         (b) The Certificates shall be issuable only in registered form and only
in denominations of a single Unit and any integral multiple thereof.

SECTION 3.2 RIGHTS AND OBLIGATIONS EVIDENCED BY THE CERTIFICATES.

         (a) Each Normal Units Certificate shall evidence the number of Normal
Units specified therein, with each such Normal Unit representing the ownership
by the Holder thereof of a beneficial interest in a Note or the appropriate
Treasury Consideration or Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, subject to the Pledge of such

                                       19
<PAGE>

Note, Treasury Consideration or Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, by such Holder pursuant to the Pledge Agreement,
and the rights and obligations of the Holder thereof and the Company under one
Purchase Contract. The Agent as attorney-in-fact for, and on behalf of, the
Holder of each Normal Unit shall pledge, pursuant to the Pledge Agreement, the
Note or the appropriate Treasury Consideration or Applicable Ownership Interest
in the Treasury Portfolio, as the case may be, forming a part of such Normal
Unit, to the Collateral Agent and grant to the Collateral Agent a security
interest in the right, title and interest of such Holder in such Note, Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, for the benefit of the Company, to secure the obligation of the
Holder under each Purchase Contract to purchase the Common Stock of the Company.
Prior to the purchase of shares of Common Stock under each Purchase Contract,
such Purchase Contracts shall not entitle the Holders of Normal Units
Certificates to any of the rights of a holder of shares of Common Stock,
including, without limitation, the right to vote or receive any dividends or
other payments or to consent or to receive notice as stockholders in respect of
the meetings of stockholders or for the election of directors of the Company or
for any other matter, or any other rights whatsoever as stockholders of the
Company.

         (b) Each Stripped Units Certificate shall evidence the number of
Stripped Units specified therein, with each such Stripped Unit representing the
ownership by the Holder thereof of a _____ undivided beneficial interest in a
Treasury Security, subject to the Pledge of such interest in such Treasury
Security by such Holder pursuant to the Pledge Agreement, and the rights and
obligations of the Holder thereof and the Company under one Purchase Contract.
Prior to the purchase of shares of Common Stock under each Purchase Contract,
such Purchase Contracts shall not entitle the Holders of Stripped Units
Certificates to any of the rights of a holder of shares of Common Stock,
including, without limitation, the right to vote or receive any dividends or
other payments or to consent or to receive notice as stockholders in respect of
the meetings of stockholders or for the election of directors of the Company or
for any other matter, or any other rights whatsoever as stockholders of the
Company.

SECTION 3.3 EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

         (a) Subject to the provisions of Sections 3.13 and 3.14, upon the
execution and delivery of this Agreement, and at any time and from time to time
thereafter, the Company may deliver Certificates executed by the Company to the
Agent for authentication, execution on behalf of the Holders and delivery,
together with its Issuer Order for authentication of such Certificates, and the
Agent in accordance with such Issuer Order shall authenticate, execute on behalf
of the Holders and deliver such Certificates.

         (b) The Certificates shall be executed on behalf of the Company by an
Authorized Officer and delivered to the Agent. The signature of any of these
officers on the Certificates may be manual or facsimile.

         (c) Certificates bearing the manual or facsimile signatures of
individuals who were at any time the proper officers of the Company shall bind
the Company, notwithstanding that such individuals or any of them have ceased to
hold such offices prior to the authentication and delivery of such Certificates
or did not hold such offices at the date of such Certificates.

                                       20
<PAGE>

         (d) No Purchase Contract evidenced by a Certificate shall be valid
until such Certificate has been executed on behalf of the Holder by the manual
signature of an authorized signatory of the Agent, as such Holder's
attorney-in-fact. Such signature by an authorized signatory of the Agent shall
be conclusive evidence that the Holder of such Certificate has entered into the
Purchase Contracts evidenced by such Certificate.

         (e) Each Certificate shall be dated the date of its authentication.

         (f) No Certificate shall be entitled to any benefit under this
Agreement or be valid or obligatory for any purpose unless there appears on such
Certificate a certificate of authentication substantially in the form provided
for herein executed by an authorized signatory of the Agent by manual signature,
and such certificate upon any Certificate shall be conclusive evidence, and the
only evidence, that such Certificate has been duly authenticated and delivered
hereunder.

SECTION 3.4 TEMPORARY CERTIFICATES.

         (a) Pending the preparation of definitive Certificates, the Company
shall execute and deliver to the Agent, and the Agent shall authenticate,
execute on behalf of the Holders, and deliver, in lieu of such definitive
Certificates, temporary Certificates which are in substantially the form set
forth in Exhibit A or Exhibit B hereto, as the case may be, with such letters,
numbers or other marks of identification or designation and such legends or
endorsements printed, lithographed or engraved thereon as may be required by the
rules of any securities exchange of quotation system on which the Normal Units
or Stripped Units, as the case may be, are listed or quoted for trading or any
depositary therefor, or as may, consistently herewith, be determined by the
officers of the Company executing such Certificates, as evidenced by their
execution of the Certificates.

         (b) If temporary Certificates are issued, the Company will cause
definitive Certificates to be prepared without unreasonable delay. After the
preparation of definitive Certificates, the temporary Certificates shall be
exchangeable for definitive Certificates upon surrender of the temporary
Certificates at the Corporate Trust Office, at the expense of the Company and
without charge to the Holder. Upon surrender for cancellation of any one or more
temporary Certificates, the Company shall execute and deliver to the Agent, and
the Agent shall authenticate, execute on behalf of the Holder, and deliver in
exchange therefor, one or more definitive Certificates of like tenor and
denominations and evidencing a like number of Normal Units or Stripped Units, as
the case may be, as the temporary Certificate or Certificates so surrendered.
Until so exchanged, the temporary Certificates shall in all respects evidence
the same benefits and the same obligations with respect to the Normal Units or
Stripped Units, as the case may be, evidenced thereby as definitive
Certificates.

SECTION 3.5 REGISTRATION; REGISTRATION OF TRANSFER AND EXCHANGE.

         (a) The Agent shall keep at the Corporate Trust Office a register (the
"Normal Units Register") in which, subject to such reasonable regulations as it
may prescribe, the Agent shall provide for the registration of Normal Units
Certificates and of transfers of Normal Units Certificates (the Agent, in such
capacity, the "Normal Units Registrar") and a register (the "Stripped Units
Register") in which, subject to such reasonable regulations as it may prescribe,

                                       21
<PAGE>

the Agent shall provide for the registration of the Stripped Units Certificates
and transfers of Stripped Units Certificates (the Agent, in such capacity, the
"Stripped Units Registrar").

         (b) Upon surrender for registration of transfer of any Certificate at
the Corporate Trust Office, the Company shall execute and deliver to the Agent,
and the Agent shall authenticate, execute on behalf of the designated transferee
or transferees, and deliver, in the name of the designated transferee or
transferees, one or more new Certificates of like tenor and denominations, and
evidencing a like number of Normal Units or Stripped Units, as the case may be.

         (c) At the option of the Holder, Certificates may be exchanged for
other Certificates, of like tenor and denominations and evidencing a like number
of Normal Units or Stripped Units, as the case may be, upon surrender of the
Certificates to be exchanged at the Corporate Trust Office. Whenever any
Certificates are so surrendered for exchange, the Company shall execute and
deliver to the Agent, and the Agent shall authenticate, execute on behalf of the
Holder, and deliver the Certificates which the Holder making the exchange is
entitled to receive.

         (d) All Certificates issued upon any registration of transfer or
exchange of a Certificate shall evidence the ownership of the same number of
Normal Units or Stripped Units, as the case may be, and be entitled to the same
benefits and subject to the same obligations, under this Agreement as the Normal
Units or Stripped Units, as the case may be, evidenced by the Certificate
surrendered upon such registration of transfer or exchange.

         (e) Every Certificate presented or surrendered for registration of
transfer or for exchange shall (if so required by the Company or the Agent) be
duly endorsed, or be accompanied by a written instrument of transfer in form
satisfactory to the Company and the Agent duly executed, by the Holder thereof
or its attorney duly authorized in writing.

         (f) No service charge shall be made for any registration of transfer or
exchange of a Certificate, but the Company and the Agent may require payment
from the Holder of a sum sufficient to cover any tax or other governmental
charge that may be imposed in connection with any registration of transfer or
exchange of Certificates, other than any exchanges pursuant to Sections 3.6, 3.9
and 8.5 not involving any transfer.

         (g) Notwithstanding the foregoing, the Company shall not be obligated
to execute and deliver to the Agent, and the Agent shall not be obligated to
authenticate, execute on behalf of the Holder and deliver any Certificate
presented or surrendered for registration of transfer or for exchange on or
after the Business Day immediately preceding the earlier of the Stock Purchase
Date or the Termination Date. In lieu of delivery of a new Certificate, upon
satisfaction of the applicable conditions specified above in this Section and
receipt of appropriate registration or transfer instructions from such Holder,
the Agent shall,

                  (i) if the Stock Purchase Date has occurred, deliver the
         shares of Common Stock issuable in respect of the Purchase Contracts
         forming a part of the Units evidenced by such Certificate,

                  (ii) in the case of Normal Units, if a Termination Event shall
         have occurred prior to the Stock Purchase Date, transfer the Notes or
         the appropriate Treasury

                                       22
<PAGE>

         Consideration or Applicable Ownership Interest in the Treasury
         Portfolio, as applicable, relating to such Normal Units, or

                  (iii) in the case of Stripped Units, if a Termination Event
         shall have occurred prior to the Stock Purchase Date, transfer the
         Treasury Securities relating to such Stripped Units,

in each case subject to the applicable conditions and in accordance with the
applicable provisions of Article V.

SECTION 3.6 BOOK-ENTRY INTERESTS.

         The Certificates, on original issuance, will be issued in the form of
one or more fully registered Global Certificates, to be delivered to the
Depositary or a nominee or custodian thereof by, or on behalf of, the Company.
Such Global Certificates shall initially be registered on the books and records
of the Company in the name of Cede & Co., the nominee of the Depositary, and no
Beneficial Owner will receive a definitive Certificate representing such
Beneficial Owner's interest in such Global Certificate, except as provided in
Section 3.9. The Agent shall enter into an agreement with the Depositary if so
requested by the Company. Unless and until definitive, fully registered
Certificates have been issued to Beneficial Owners pursuant to Section 3.9:

         (a) the provisions of this Section 3.6 shall be in full force and
effect;

         (b) the Company shall be entitled to deal with the Clearing Agency for
all purposes of this Agreement (including the payment of Contract Adjustment
Payments, if any, and receiving approvals, votes or consents hereunder) as the
Holder of the Units and the sole holder of the Global Certificate(s) and shall
have no obligation to the Beneficial Owners;

         (c) to the extent that the provisions of this Section 3.6 conflict with
any other provisions of this Agreement or any Certificate, the provisions of
this Section 3.6 shall control; and

         (d) the rights of the Beneficial Owners shall be exercised only through
the Clearing Agency and shall be limited to those established by law and
agreements between such Beneficial Owners and the Clearing Agency and/or the
Clearing Agency Participants.

         The Clearing Agency will make book-entry transfers among Clearing
Agency Participants and receive and transmit payments of Contract Adjustment
Payments to such Clearing Agency Participants.

SECTION 3.7 NOTICES TO HOLDERS.

         Whenever a notice or other communication to the Holders is required to
be given under this Agreement, the Company or the Company's agent shall give
such notices and communications to the Holders and, with respect to any Units
registered in the name of a Clearing Agency or the nominee of a Clearing Agency,
the Company or the Company's agent shall, except as set forth herein, have no
obligation to the Beneficial Owners.

                                       23
<PAGE>

SECTION 3.8 APPOINTMENT OF SUCCESSOR CLEARING AGENCY.

         If any Clearing Agency elects to discontinue its services as securities
depositary with respect to the Units, the Company may, in its sole discretion,
appoint a successor Clearing Agency with respect to the Units.

SECTION 3.9 DEFINITIVE CERTIFICATES.

         If

                  (i) a Clearing Agency notifies the Company that it is
         unwilling or unable to continue its services as securities depositary
         with respect to the Units and a successor Clearing Agency is not
         appointed within 90 days after such discontinuance pursuant to Section
         3.8, or

                  (ii) the Company elects to terminate the book-entry system
         through the Clearing Agency with respect to the Units,

then upon surrender of the Global Certificates representing the Book-Entry
Interests with respect to the Units by the Clearing Agency, accompanied by
registration instructions, the Company shall cause definitive Certificates to be
delivered to Beneficial Owners in accordance with the instructions of the
Clearing Agency. The Company shall not be liable for any delay in delivery of
such instructions and may conclusively rely on and shall be protected in relying
on, such instructions.

SECTION 3.10 MUTILATED, DESTROYED, LOST AND STOLEN CERTIFICATES.

         (a) If any mutilated Certificate is surrendered to the Agent, the
Company shall execute and deliver to the Agent, and the Agent shall
authenticate, execute on behalf of the Holder, and deliver in exchange therefor,
a new Certificate at the cost of the Holder, evidencing the same number of
Normal Units or Stripped Units, as the case may be, and bearing a Certificate
number not contemporaneously outstanding.

         (b) If there shall be delivered to the Company and the Agent (i)
evidence to their satisfaction of the destruction, loss or theft of any
Certificate, and (ii) such security or indemnity at the cost of the Holder as
may be required by them to hold each of them and any agent of either of them
harmless, then, in the absence of notice to the Company or the Agent that such
Certificate has been acquired by a bona fide purchaser, the Company shall
execute and deliver to the Agent, and the Agent shall authenticate, execute on
behalf of the Holder, and deliver to the Holder, in lieu of any such destroyed,
lost or stolen Certificate, a new Certificate, evidencing the same number of
Normal Units or Stripped Units, as the case may be, and bearing a Certificate
number not contemporaneously outstanding.

         (c) Notwithstanding the foregoing, the Company shall not be obligated
to execute and deliver to the Agent, and the Agent shall not be obligated to
authenticate, execute on behalf of the Holder, and deliver any Certificate on or
after the Business Day immediately preceding the earlier of the Stock Purchase
Date or the Termination Date. In lieu of delivery of a new Certificate, upon
satisfaction of the applicable conditions specified above in this Section and

                                       24
<PAGE>

receipt of appropriate registration or transfer instructions from such Holder,
the Agent shall (i) if the Stock Purchase Date has occurred, deliver the shares
of Common Stock issuable in respect of the Purchase Contracts forming a part of
the Units evidenced by such Certificate, or (ii) if a Termination Event shall
have occurred prior to the Stock Purchase Date, transfer the Notes, the
appropriate Treasury Consideration or Applicable Ownership Interest in the
Treasury Portfolio, or the Treasury Securities, as the case may be, evidenced
thereby, in each case subject to the applicable conditions and in accordance
with the applicable provisions of Article V.

         (d) Upon the issuance of any new Certificate under this Section, the
Company and the Agent may require the payment by the Holder of a sum sufficient
to cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Agent)
connected therewith.

         (e) Every new Certificate issued pursuant to this Section in lieu of
any destroyed, lost or stolen Certificate shall constitute an original
additional contractual obligation of the Company and of the Holder in respect of
the Unit evidenced thereby, whether or not the destroyed, lost or stolen
Certificate (and the Units evidenced thereby) shall be at any time enforceable
by anyone, and shall be entitled to all the benefits and be subject to all the
obligations of this Agreement equally and proportionately with any and all other
Certificates delivered hereunder.

         (f) The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Certificates.

SECTION 3.11 PERSONS DEEMED OWNERS.

         (a) Prior to due presentment of a Certificate for registration of
transfer, the Company, the Agent and its Affiliates, and any agent of the
Company or the Agent, may treat the Person in whose name such Certificate is
registered on the Register as the owner of the Units evidenced thereby for the
purpose of receiving quarterly payments on the Notes, the Treasury Consideration
or the Applicable Ownership Interest in the Treasury Portfolio, as the case may
be, receiving payments of Contract Adjustment Payments, if any, and any Deferred
Contract Adjustment Payments, performance of the Purchase Contracts and for all
other purposes whatsoever, whether or not any payments in respect thereof shall
be overdue and notwithstanding any notice to the contrary, and neither the
Company, the Agent, such Affiliates nor any agent of the Company, the Agent or
such Affiliates, shall be affected by notice to the contrary.

         (b) Notwithstanding the foregoing, with respect to any Global
Certificate, nothing herein shall prevent the Company, the Agent or any agent of
the Company or the Agent, from treating the Clearing Agency as the sole Holder
of such Global Certificate or from giving effect to any written certification,
proxy or other authorization furnished by any Clearing Agency (or its nominee),
as a Holder, with respect to such Global Certificate or impair, as between such
Clearing Agency and owners of beneficial interests in such Global Certificate,
the operation of customary practices governing the exercise of rights of such
Clearing Agency (or its nominee) as Holder of such Global Certificate.

                                       25
<PAGE>

SECTION 3.12 CANCELLATION.

         (a) All Certificates surrendered (i) for delivery of shares of Common
Stock on or after any Settlement Date; (ii) upon the transfer of Notes, the
appropriate Treasury Consideration or Applicable Ownership Interest in the
Treasury Portfolio, or Treasury Securities, as the case may be, after the
occurrence of a Termination Event; or (iii) upon the registration of a transfer
or exchange of a Unit shall, if surrendered to any Person other than the Agent,
be delivered to the Agent and, if not already cancelled, shall be promptly
cancelled by it. The Company may at any time deliver to the Agent for
cancellation any Certificates previously authenticated, executed and delivered
hereunder which the Company may have acquired in any manner whatsoever, and all
Certificates so delivered shall, upon Issuer Order, be promptly cancelled by the
Agent. No Certificates shall be authenticated, executed on behalf of the Holder
and delivered in lieu of or in exchange for any Certificates cancelled as
provided in this Section, except as expressly permitted by this Agreement. All
cancelled Certificates held by the Agent shall upon written request be returned
to the Company.

         (b) If the Company or any Affiliate of the Company shall acquire any
Certificate, such acquisition shall not operate as a cancellation of such
Certificate unless and until such Certificate is delivered to the Agent
cancelled or for cancellation.

SECTION 3.13 ESTABLISHMENT OF STRIPPED UNITS.

         (a) A Holder may separate the Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as applicable, from the related Purchase Contracts in respect of the
Normal Units held by such Holder by substituting for such Pledged Notes, Pledged
Treasury Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, Treasury Securities that will pay, on the Stock
Purchase Date, an amount equal to the aggregate principal amount of such Notes
or the appropriate Treasury Consideration or Applicable Ownership Interest (as
specified in clause (A) of the definition of such term) of the Treasury
Portfolio (a "Collateral Substitution"), at any time from and after the date of
this Agreement and on or prior to the second Business Day immediately preceding
the Stock Purchase Date, by (i) depositing with the Collateral Agent Treasury
Securities having an aggregate principal amount equal to the aggregate Stated
Amount of such Normal Units, and (ii) transferring the related Normal Units to
the Agent accompanied by a notice to the Agent, substantially in the form of
Exhibit D hereto, stating that the Holder has transferred the relevant amount of
Treasury Securities to the Collateral Agent and requesting that the Agent
instruct the Collateral Agent to release the Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest of the Treasury
Portfolio, as the case may be, underlying such Normal Units, whereupon the Agent
shall promptly give such instruction to the Collateral Agent, substantially in
the form of Exhibit C hereto. Notwithstanding the foregoing, a Holder may not
separate the Pledged Notes, Pledged Treasury Consideration or Pledged Applicable
Ownership Interest of the Treasury Portfolio, as the case may be, from the
related Purchase Contracts in respect of the Normal Units held by such Holder
during the periods beginning on the fourth Business Day prior to the first day
of any Remarketing Period and ending on the third business day after the end of
such Remarketing Period. Upon receipt of the Treasury Securities described in
clause (i) above and the instruction described in clause (ii) above, in
accordance with the terms of the Pledge Agreement, the

                                       26
<PAGE>

Collateral Agent will release to the Agent, on behalf of the Holder, such
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest of the Treasury Portfolio, as the case may be, from the Pledge, free
and clear of the Company's security interest therein, and upon receipt thereof
the Agent shall promptly:

                  (i) cancel the related Normal Units;

                  (ii) transfer the Pledged Notes, Pledged Treasury
         Consideration or Pledged Applicable Ownership Interest of the Treasury
         Portfolio, as the case may be, to the Holder; and

                  (iii) authenticate, execute on behalf of such Holder and
         deliver a Stripped Units Certificate executed by the Company in
         accordance with Section 3.3 evidencing the same number of Purchase
         Contracts as were evidenced by the cancelled Normal Units.

         (b) Holders who elect to separate the Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest of the Treasury
Portfolio, as the case may be, from the related Purchase Contract and to
substitute Treasury Securities for such Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest of the Treasury
Portfolio, as the case may be, shall be responsible for any fees or expenses
payable to the Collateral Agent for its services as Collateral Agent in respect
of the substitution, and the Company shall not be responsible for any such fees
or expenses.

         (c) Holders may make Collateral Substitutions (i) if Treasury
Securities are being substituted for Pledged Notes, only in integral multiples
of ____ Normal Units, or (ii) if the Collateral Substitutions occur after the
Remarketing Date or any Subsequent Remarketing Date, or after a Tax Event
Redemption, as the case may be, only in integral multiples of Normal Units such
that the Treasury Securities to be deposited and the Treasury Consideration, or
the Applicable Ownership Interest in the Treasury Portfolio, as the case may be,
to be released are in integral multiples of $1,000.

         (d) In the event a Holder making a Collateral Substitution pursuant to
this Section 3.13 fails to effect a book-entry transfer of the Normal Units or
fails to deliver a Normal Units Certificate to the Agent after depositing
Treasury Securities with the Collateral Agent, the Pledged Notes, Pledged
Treasury Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, constituting a part of such Normal Units, and any
distributions on such Pledged Notes, Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the Treasury Portfolio, as the case may be,
shall be held in the name of the Agent or its nominee in trust for the benefit
of such Holder, until such Normal Units are so transferred or the Normal Units
Certificate is so delivered, as the case may be, or, with respect to a Normal
Units Certificate, such Holder provides evidence satisfactory to the Company and
the Agent that such Normal Units Certificate has been destroyed, lost or stolen,
together with any indemnity that may be required by the Agent and the Company.

         (e) Except as described in this Section 3.13, for so long as the
Purchase Contract underlying a Normal Unit remains in effect, such Normal Unit
shall not be separable into its constituent parts, and the rights and
obligations of the Holder of such Normal Unit in respect of

                                       27
<PAGE>

the Pledged Note, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, and the Purchase
Contract comprising such Normal Unit may be acquired, and may be transferred and
exchanged, only as a Normal Unit.

SECTION 3.14 RE-ESTABLISHMENT OF NORMAL UNITS.

         (a) A Holder of Stripped Units may reestablish Normal Units at any time
from and after the date of this Agreement and on or prior to the second Business
Day immediately preceding the Stock Purchase Date, by (i) depositing with the
Collateral Agent the Notes or the appropriate Treasury Consideration or
Applicable Ownership Interest in the Treasury Portfolio (identified and
calculated by reference to the Treasury Consideration then comprising Normal
Units), as the case may be, then comprising such number of Normal Units as is
equal to such Stripped Units and (ii) transferring such Stripped Units to the
Agent accompanied by a notice to the Agent, substantially in the form of Exhibit
D hereto, stating that the Holder has transferred the relevant amount of Notes
or the appropriate Treasury Consideration or Applicable Ownership Interest in
the Treasury Portfolio, as the case may be, to the Collateral Agent and
requesting that the Agent instruct the Collateral Agent to release the Pledged
Treasury Securities underlying such Stripped Unit, whereupon the Agent shall
promptly give such instruction to the Collateral Agent, substantially in the
form of Exhibit C hereto. Notwithstanding the foregoing, a Holder may not
reestablish Normal Units during the periods beginning on the fourth Business Day
prior to the first day of any Remarketing Period and ending on the third
business day after the end of such Remarketing Period. Upon receipt of the Notes
or the appropriate Treasury Consideration or Applicable Ownership Interest in
the Treasury Portfolio, as the case may be, described in clause (i) above and
the instruction described in clause (ii) above, in accordance with the terms of
the Pledge Agreement, the Collateral Agent will release to the Agent, on behalf
of the Holder, such Pledged Treasury Securities from the Pledge, free and clear
of the Company's security interest therein, and upon receipt thereof the Agent
shall promptly:

                  (i) cancel the related Stripped Units;

                  (ii) transfer the Pledged Treasury Securities to the Holder;
         and

                  (iii) authenticate, execute on behalf of such Holder and
         deliver a Normal Units Certificate executed by the Company in
         accordance with Section 3.3 evidencing the same number of Purchase
         Contracts as were evidenced by the cancelled Stripped Units.

         (b) Holders of Stripped Units may reestablish Normal Units (i) only in
integral multiples of ____ Stripped Units for ____ Normal Units or (ii) if the
re-establishment occurs after a successful remarketing of the Notes pursuant to
the provisions of Section 5.4, or after a Tax Event Redemption, only in integral
multiples of Stripped Units such that the Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio to be deposited and the Treasury
Securities to be released are in integral multiples of $1,000.

         (c) Except as provided in this Section 3.14, for so long as the
Purchase Contract underlying a Stripped Unit remains in effect, such Stripped
Unit shall not be separable into its constituent parts, and the rights and
obligations of the Holder of such Stripped Unit in respect of

                                       28
<PAGE>

the Treasury Security and Purchase Contract comprising such Stripped Unit may be
acquired, and may be transferred and exchanged, only as a Stripped Unit.

SECTION 3.15 TRANSFER OF COLLATERAL UPON OCCURRENCE OF TERMINATION EVENT.

         Upon the occurrence of a Termination Event and the transfer to the
Agent of the Notes, the appropriate Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio, or the Treasury Securities, as the
case may be, underlying the Normal Units and the Stripped Units pursuant to the
terms of the Pledge Agreement, the Agent shall request transfer instructions
with respect to such Notes or the appropriate Treasury Consideration or
Applicable Ownership Interest in the Treasury Portfolio or the Treasury
Securities, as the case may be, from each Holder by written request mailed to
such Holder at its address as it appears in the Normal Units Register or the
Stripped Units Register, as the case may be. Upon book-entry transfer of the
Normal Units or Stripped Units or delivery of a Normal Units Certificate or
Stripped Units Certificate to the Agent with such transfer instructions, the
Agent shall transfer the Notes, the appropriate Treasury Consideration or
Applicable Ownership Interest in the Treasury Portfolio, or the Treasury
Securities, as the case may be, underlying such Normal Units or Stripped Units,
as the case may be, to such Holder by book-entry transfer, or other appropriate
procedures, in accordance with such instructions. In the event a Holder of
Normal Units or Stripped Units fails to effect such transfer or delivery, the
Notes, the appropriate Treasury Consideration or Applicable Ownership Interest
in the Treasury Portfolio, or the Treasury Securities, as the case may be,
underlying such Normal Units or Stripped Units, as the case may be, and any
distributions thereon, shall be held in the name of the Agent or its nominee in
trust for the benefit of such Holder, until such Normal Units or Stripped Units
are transferred or the Normal Units Certificate or Stripped Units Certificate is
surrendered or such Holder provides satisfactory evidence that such Normal Units
Certificate or Stripped Units Certificate has been destroyed, lost or stolen,
together with any indemnity that may be required by the Agent and the Company.
In the case of the Treasury Portfolio or any Treasury Securities, the Agent may
dispose of the subject securities for cash and pay the applicable portion of
such cash to the Holders in lieu of such Holders' Applicable Ownership Interest
in such Treasury Portfolio, or any Treasury Securities, where such Holder would
otherwise have been entitled to receive less than $1,000 of any such security.

SECTION 3.16 NO CONSENT TO ASSUMPTION.

         Each Holder of a Unit, by acceptance thereof, will be deemed expressly
to have withheld any consent to the assumption (i.e., affirmance) under Section
365 of the Bankruptcy Code or otherwise, of the Purchase Contract by the
Company, its trustee in bankruptcy, any receiver, liquidator or person or entity
performing similar functions in the event that the Company becomes a debtor
under the Bankruptcy Code or subject to other similar state or federal law
providing for reorganization or liquidation.

                                       29
<PAGE>

                                   ARTICLE IV.

                                    THE NOTES

SECTION 4.1 PAYMENT OF INTEREST; RIGHTS TO INTEREST PAYMENTS PRESERVED; NOTICE.

         (a) A payment on any Note, Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio, as the case may be, which is paid
on any Payment Date shall, subject to receipt thereof by the Agent from the
Collateral Agent as provided by the terms of the Pledge Agreement, be paid to
the Person in whose name the Normal Units Certificate (or one or more
Predecessor Normal Units Certificates) of which such Note or the appropriate
Treasury Consideration or Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, is a part is registered at the close of business
on the Record Date for such Payment Date.

         (b) Each Normal Units Certificate evidencing Notes delivered under this
Agreement upon registration of transfer of or in exchange for or in lieu of any
other Normal Units Certificate shall carry the rights to interest accrued and
unpaid, and to accrue interest, which is carried by the Notes underlying such
other Normal Units Certificate.

         (c) In the case of any Normal Unit with respect to which Early
Settlement of the underlying Purchase Contract is effected on an Early
Settlement Date, Merger Early Settlement of the underlying Purchase Contract is
effected on a Merger Early Settlement Date, Cash Settlement is effected on the
Business Day immediately preceding the Stock Purchase Date, or a Collateral
Substitution is effected, in each case on a date that is after any Record Date
and on or prior to the next succeeding Payment Date, payments on the Note or the
appropriate Treasury Consideration or Applicable Ownership Interest in the
Treasury Portfolio, as the case may be, underlying such Normal Unit otherwise
payable on such Payment Date shall be payable on such Payment Date
notwithstanding such Early Settlement, Merger Early Settlement, Cash Settlement
or Collateral Substitution, as the case may be, and such payments shall, subject
to receipt thereof by the Agent, be payable to the Person in whose name the
Normal Units Certificate (or one or more Predecessor Normal Unit Certificates)
was registered at the close of business on the Record Date. Except as otherwise
expressly provided in the immediately preceding sentence, in the case of any
Normal Unit with respect to which Early Settlement, Merger Early Settlement or
Cash Settlement of the underlying Purchase Contract is effected, or with respect
to which a Collateral Substitution has been effected, payments on the related
Notes or payments on the appropriate Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio, as the case may be, that would
otherwise be payable after the applicable Settlement Date or after such
Collateral Substitution, as the case may be, shall not be payable hereunder to
the Holder of such Normal Unit; provided, that to the extent that such Holder
continues to hold the Separate Notes that formerly comprised a part of such
Holder's Normal Units, such Holder shall be entitled to receive the payments on
such Separate Notes.

SECTION 4.2 NOTICE AND VOTING.

         Under and subject to the terms of the Pledge Agreement and this
Agreement, the Agent will be entitled to exercise the voting and any other
consensual rights pertaining to the Pledged Notes but only to the extent
instructed by the Holders as described below. Upon receipt of notice

                                       30
<PAGE>

of any meeting at which holders of Notes are entitled to vote or upon any
solicitation of consents, waivers or proxies of holders of Notes, the Agent
shall, as soon as practicable thereafter, mail to the Holders of Normal Units a
notice (a) containing such information as is contained in the notice or
solicitation, (b) stating that each Holder on the record date set by the Agent
therefor (which, to the extent possible, shall be the same date as the record
date for determining the holders of Notes entitled to vote) shall be entitled to
instruct the Agent as to the exercise of the voting rights pertaining to the
Pledged Notes constituting a part of such Holder's Normal Units and (c) stating
the manner in which such instructions may be given. Upon the written request of
the Holders of Normal Units on such record date, the Agent shall endeavor
insofar as practicable to vote or cause to be voted, in accordance with the
instructions set forth in such requests, the maximum number of Pledged Notes as
to which any particular voting instructions are received. In the absence of
specific instructions from the Holder of a Normal Unit, the Agent shall abstain
from voting the Pledged Note underlying such Normal Unit. The Company hereby
agrees, if applicable, to solicit Holders of Normal Units to timely instruct the
Agent in order to enable the Agent to vote such Pledged Notes.

SECTION 4.3 TAX EVENT REDEMPTION.

         Upon the occurrence of a Tax Event Redemption prior to a successful
remarketing of the Notes pursuant to the provisions of Section 5.4, the Company
may elect to instruct in writing the Collateral Agent to apply, and upon such
written instruction, the Collateral Agent shall apply, out of the aggregate
Redemption Price for the Notes that are components of Normal Units, an amount
equal to the aggregate Tax Event Redemption Principal Amount for the Notes that
are components of Normal Units to purchase on behalf of the Holders of Normal
Units the Treasury Portfolio and promptly remit the remaining portion of such
Redemption Price to the Agent for payment to the Holders of such Normal Units.
The Treasury Portfolio will be substituted for the Pledged Notes, and will be
pledged to the Collateral Agent in accordance with the terms of the Pledge
Agreement to secure the obligation of each Holder of a Normal Unit to purchase
the Common Stock under the Purchase Contract constituting a part of such Normal
Unit. Following the occurrence of a Tax Event Redemption prior to a successful
remarketing of the Notes pursuant to the provisions of Section 5.4, the Holders
of Normal Units and the Collateral Agent shall have such security interests,
rights and obligations with respect to the Treasury Portfolio as the Holder of
Normal Units and the Collateral Agent had in respect of the Notes, as the case
may be, subject to the Pledge thereof as provided in Articles II, III, IV, V and
VI of the Pledge Agreement, and any reference herein or in the Certificates to
the Note shall be deemed to be a reference to such Treasury Portfolio and any
reference herein or in the Certificates to interest on the Notes shall be deemed
to be a reference to corresponding distributions on the Treasury Portfolio. The
Company may cause to be made in any Normal Unit Certificates thereafter to be
issued such change in phraseology and form (but not in substance) as may be
appropriate to reflect the substitution of the Treasury Portfolio for Notes as
collateral.

         The Company shall cause notice of any Tax Event Redemption to be
mailed, at least 30 calendar days but not more than 60 calendar days before such
Tax Event Redemption Date, to each Holder of Notes to be redeemed at its
registered address.

         Upon the occurrence of a Tax Event Redemption after the successful
remarketing of the Notes, the Redemption Price will be payable in cash to the
holders of the Notes.

                                       31
<PAGE>

SECTION 4.4 CONSENT TO TREATMENT FOR TAX PURPOSES

         Each Holder of a Normal Unit or a Stripped Unit, by its acceptance
thereof, covenants and agrees to treat itself as the owner, for federal, state
and local income and franchise tax purposes, of (i) the related Notes, the
appropriate Treasury Consideration or the Applicable Ownership Interest in the
Treasury Portfolio, in the case of the Normal Units, or (ii) the Treasury
Securities, in the case of the Stripped Units. Each Holder of a Normal Unit, by
its acceptance thereof, further covenants and agrees to treat the Notes as
indebtedness of the Company for federal, state and local income and franchise
tax purposes.

                                   ARTICLE V.

                     THE PURCHASE CONTRACTS; THE REMARKETING

SECTION 5.1 PURCHASE OF SHARES OF COMMON STOCK.

         (a) Each Purchase Contract shall, unless an Early Settlement has
occurred in accordance with Section 5.9, or a Merger Early Settlement has
occurred in accordance with Section 5.10, obligates the Holder of the related
Unit to purchase, and the Company to sell, on the Stock Purchase Date at a price
equal to $_____ (the "Purchase Price"), a number of newly issued shares of
Common Stock equal to the Settlement Rate unless, on or prior to the Stock
Purchase Date, there shall have occurred a Termination Event with respect to the
Unit of which such Purchase Contract is a part. The "Settlement Rate" is equal
to

                  (i) if the Applicable Market Value (as defined below) is equal
         to or greater than $____ (the "Threshold Appreciation Price"), ______
         shares of Common Stock per Purchase Contract,

                  (ii) if the Applicable Market Value is less than the Threshold
         Appreciation Price, but is greater than $____, the number of shares of
         Common Stock per Purchase Contract equal to the Stated Amount of the
         related Unit divided by the Applicable Market Value, and

                  (iii) if the Applicable Market Value is less than or equal to
         $____, ______ shares of Common Stock per Purchase Contract,

in each case subject to adjustment as provided in Section 5.6 (and in each case
rounded upward or downward to the nearest 1/10,000th of a share). As provided in
Section 5.12, no fractional shares of Common Stock will be issued upon
settlement of Purchase Contracts.

         (b) No fractional shares of Common Stock will be issued by the Company
with respect to the payment of Contract Adjustment Payments on the Stock
Purchase Date. In lieu of fractional shares otherwise issuable with respect to
such payment of Contract Adjustment Payments, the Holder will be entitled to
receive an amount in cash as provided in Section 5.12.

         (c) The "Applicable Market Value" means the average of the Closing
Price per share of Common Stock on each of the 20 consecutive Trading Days
ending on the third Trading Day immediately preceding the Stock Purchase Date
or, in the event of a Cash Merger contemplated

                                       32
<PAGE>

by Section 5.10, the Cash Merger Date. The "Closing Price" of the Common Stock
on any date of determination means the closing sale price per share (or, if no
closing sale price is reported, the last reported sale price) of the Common
Stock on the New York Stock Exchange (the "NYSE") on such date or, if the Common
Stock is not listed for trading on the NYSE on any such date, as reported in the
composite transactions for the principal United States securities exchange on
which the Common Stock is so listed, or if the Common Stock is not so listed on
a United States securities exchange, as reported by The Nasdaq Stock Market, or
if the Common Stock is not so reported, the last quoted bid price for the Common
Stock in the over-the-counter market as reported by the National Quotation
Bureau or similar organization, or if such bid price is not available, the
market value of the Common Stock on such date as determined by a nationally
recognized independent investment banking firm retained by the Company for this
purpose. A "Trading Day" means a day on which the Common Stock (A) is not
suspended from trading on any national or regional securities exchange or
association or over-the-counter market at the close of business and (B) has
traded at least once on the national or regional securities exchange or
association or over-the-counter market that is the primary market for the
trading of the Common Stock at the close of business on such day.

         (d) Each Holder of a Unit, by its acceptance thereof, irrevocably
authorizes the Agent to enter into and perform the related Purchase Contract on
its behalf as its attorney-in-fact (including the execution of Certificates on
behalf of such Holder), agrees to be bound by the terms and provisions thereof,
covenants and agrees to perform its obligations under such Purchase Contract,
consents to the provisions hereof, irrevocably authorizes the Agent as its
attorney-in-fact to enter into and perform the Pledge Agreement on its behalf as
its attorney-in-fact, and consents to and agrees to be bound by the Pledge of
the Notes, the appropriate Treasury Consideration or Applicable Ownership
Interest in the Treasury Portfolio, or the Treasury Securities, as the case may
be, pursuant to the Pledge Agreement; provided that upon a Termination Event,
the rights of the Holder of such Unit under the Purchase Contract may be
enforced without regard to any other rights or obligations. Each Holder of a
Unit, by its acceptance thereof, further covenants and agrees, that, to the
extent and in the manner provided in Section 5.4 and the Pledge Agreement, but
subject to the terms thereof, payments in respect of the Pledged Notes, the
Pledged Treasury Consideration or Pledged Applicable Ownership Interest in the
Treasury Portfolio, or the Treasury Securities, as the case may be, to be paid
upon settlement of such Holder's obligations to purchase Common Stock under the
Purchase Contract, shall be paid on the Stock Purchase Date by the Collateral
Agent to the Company in satisfaction of such Holder's obligations under such
Purchase Contract and such Holder shall acquire no right, title or interest in
such payments.

         (e) Upon registration of transfer of a Certificate, the transferee
shall be bound (without the necessity of any other action on the part of such
transferee, except as may be required by the Agent pursuant hereto) under the
terms of this Agreement, the Purchase Contracts underlying such Certificate and
the Pledge Agreement and the transferor shall be released from the obligations
under this Agreement, the Purchase Contracts underlying the Certificates so
transferred and the Pledge Agreement. The Company covenants and agrees, and each
Holder of a Certificate, by its acceptance thereof, likewise covenants and
agrees, to be bound by the provisions of this paragraph.

                                       33
<PAGE>

SECTION 5.2 CONTRACT ADJUSTMENT PAYMENTS.

         (a) Subject to Section 5.3 herein, the Company shall pay, on each
Payment Date, the Contract Adjustment Payments, if any, payable in respect of
each Purchase Contract to the Person in whose name a Certificate (or one or more
Predecessor Certificates) is registered on the Register at the close of business
on the Record Date next preceding such Payment Date in such coin or currency of
the United States as at the time of payment shall be legal tender for payments.
The Contract Adjustment Payments, if any, will be payable at the Corporate Trust
Office or, at the option of the Company, by check mailed to the address of the
Person entitled thereto at such Person's address as it appears on the Register
or by wire transfer to an account appropriately designated by a prior written
notice by such Person.

         (b) Upon the occurrence of a Termination Event, the Company's
obligation to pay Contract Adjustment Payments (including any accrued or
Deferred Contract Adjustment Payments), if any, shall cease.

         (c) Each Certificate delivered under this Agreement upon registration
of transfer of or in exchange for or in lieu of any other Certificate (including
as a result of a Collateral Substitution or the re-establishment of a Normal
Unit) shall carry the rights to Contract Adjustment Payments, if any, accrued
and unpaid, and to accrue Contract Adjustment Payments, if any, which is carried
by the Purchase Contracts underlying such other Certificates.

         (d) Subject to Sections 5.4, 5.9 and 5.10, in the case of any Unit with
respect to which Early Settlement or Merger Early Settlement of the underlying
Purchase Contract is effected on an Early Settlement Date or a Merger Early
Settlement Date, respectively, or in respect of which Cash Settlement of the
underlying Purchase Contract is effected on the Business Day immediately
preceding the Stock Purchase Date, or with respect to which a Collateral
Substitution or an establishment or re-establishment of a Normal Unit pursuant
to Section 3.14 is effected, in each case on a date that is after any Record
Date and on or prior to the next succeeding Payment Date, Contract Adjustment
Payments on the Purchase Contract underlying such Unit otherwise payable on such
Payment Date shall be payable on such Payment Date notwithstanding such Cash
Settlement, Early Settlement, Merger Early Settlement, Collateral Substitution
or establishment or re-establishment of Normal Units, and such Contract
Adjustment Payments shall, subject to the receipt thereof by the Agent, be paid
to the Person in whose name the Certificate evidencing such Unit (or one or more
Predecessor Certificates) was registered at the close of business on such Record
Date. Except as otherwise expressly provided in the immediately preceding
sentence, in the case of any Unit with respect to which Cash Settlement, Early
Settlement or Merger Early Settlement of the underlying Purchase Contract is
effected on the Business Day immediately preceding the Stock Purchase Date, an
Early Settlement Date or Merger Early Settlement Date, as the case may be, or
with respect to which a Collateral Substitution or an establishment or
re-establishment of a Normal Unit has been effected, Contract Adjustment
Payments, if any, that would otherwise be payable after the Early Settlement
Date, or Merger Early Settlement Date, Collateral Substitution or such
establishment or re-establishment with respect to such Purchase Contract shall
not be payable.

                                       34
<PAGE>

         (e) The Company's obligations with respect to Contract Adjustment
Payments (including any accrued or Deferred Contract Adjustment Payments), will
be subordinate and junior in right of payment to the Company's obligations under
any Senior Indebtedness.

SECTION 5.3 DEFERRAL OF CONTRACT ADJUSTMENT PAYMENTS.

         (a) The Company shall have the right, at any time prior to the Stock
Purchase Date, to defer the payment of any or all of the Contract Adjustment
Payments otherwise payable on any Payment Date, but only if the Company shall
give the Holders and the Agent written notice of its election to defer each such
deferred Contract Adjustment Payment (specifying the amount to be deferred) at
least ten Business Days prior to the earlier of

                  (i) the next succeeding Payment Date or

                  (ii) the date the Company is required to give notice of the
         Record Date or Payment Date with respect to payment of such Contract
         Adjustment Payments to the NYSE or other applicable self-regulatory
         organization or to Holders of the Units, but in any event not less than
         one Business Day prior to such Record Date.

Any Contract Adjustment Payments so deferred shall, to the extent permitted by
law, accrue additional Contract Adjustment Payments thereon at the rate of ____%
per year (computed on the basis of a 360-day year of twelve 30-day months),
compounding on each succeeding Payment Date, until paid in full (such deferred
installments of Contract Adjustment Payments, if any, together with the
additional Contract Adjustment Payments, if any, accrued thereon, are referred
to herein as the "Deferred Contract Adjustment Payments"). Deferred Contract
Adjustment Payments, if any, shall be due on the next succeeding Payment Date
except to the extent that payment is deferred pursuant to this Section 5.3. No
Contract Adjustment Payments may be deferred to a date that is after the Stock
Purchase Date and no such deferral period may end other than on a Payment Date.
If the Purchase Contracts are terminated upon the occurrence of a Termination
Event, the Holder's right to receive Contract Adjustment Payments, if any, and
Deferred Contract Adjustment Payments will terminate.

         (b) In the event that the Company elects to defer the payment of
Contract Adjustment Payments on the Purchase Contracts until a Payment Date
prior to the Stock Purchase Date, then all Deferred Contract Adjustment
Payments, if any, shall be payable to the registered Holders as of the close of
business on the Record Date immediately preceding such Payment Date.

         (c) In the event that the Company elects to defer the payment of
Contract Adjustment Payments on the Purchase Contracts until the Stock Purchase
Date, each Holder will receive on the Stock Purchase Date in lieu of a cash
payment a number of shares of Common Stock (in addition to a number of shares of
Common Stock equal to the Settlement Rate) equal to (A) the aggregate amount of
Deferred Contract Adjustment Payments payable to such Holder divided by (B) the
Applicable Market Value.

         (d) No fractional shares of Common Stock will be issued by the Company
with respect to the payment of Deferred Contract Adjustment Payments on the
Stock Purchase Date. In lieu of fractional shares otherwise issuable with
respect to such payment of Deferred Contract

                                       35
<PAGE>

Adjustment Payments, the Holder will be entitled to receive an amount in cash as
provided in Section 5.12.

         (e) In the event the Company exercises its option to defer the payment
of Contract Adjustment Payments, then until the Deferred Contract Adjustment
Payments have been paid, the Company shall not, and will not permit any
subsidiary of the Company to, declare or pay dividends on, make distributions
with respect to, or redeem, purchase or acquire, or make a liquidation payment
with respect to, any of the Company's Capital Stock other than:

                  (i) purchases, redemptions or acquisitions of shares of the
         Company's Capital Stock in connection with any employment contract,
         benefit plan or other similar arrangement with or for the benefit of
         employees, officers, directors or agents or a stock purchase or
         dividend reinvestment plan, or the satisfaction by the Company of its
         obligations pursuant to any contract or security outstanding on the
         date the Company exercises its right to defer the payment of Contract
         Adjustment Payments;

                  (ii) as a result of a reclassification of the Company's
         Capital Stock or the exchange or conversion of one class or series of
         the Company's Capital Stock for another class or series of the
         Company's Capital Stock;

                  (iii) the purchase of fractional interests of the Company's
         Capital Stock pursuant to the conversion or exchange provisions of such
         Capital Stock or the security being converted or exchanged;

                  (iv) dividends or distributions in any series of the Company's
         Capital Stock (or rights to acquire the Company's Capital Stock) or
         repurchases, acquisitions or redemptions of the Company's Capital Stock
         in connection with the issuance or exchange of any series of the
         Company's Capital Stock (or securities convertible into or exchangeable
         for shares of the Company's Capital Stock); or

                  (v) redemptions, exchanges or repurchases of any rights
         outstanding under a shareholder rights plan or the declaration or
         payment thereunder of a dividend or distribution of or with respect to
         rights in the future.

SECTION 5.4 PAYMENT OF PURCHASE PRICE; REMARKETING.

         (a) Unless a Tax Event Redemption, successful remarketing of the Notes
pursuant to the provisions of this Section 5.4, Termination Event, Merger Early
Settlement or Early Settlement has occurred, each Holder of a Normal Unit may
pay in cash ("Cash Settlement") the Purchase Price for the shares of Common
Stock to be purchased pursuant to a Purchase Contract if such Holder notifies
the Agent by use of a notice in substantially the form of Exhibit E hereto of
its intention to make a Cash Settlement. Such notice shall be made at or prior
to 5:00 p.m., New York City time, on the seventh Business Day immediately
preceding the Stock Purchase Date. The Agent shall promptly notify the
Collateral Agent of the receipt of such a notice from a Holder intending to make
a Cash Settlement.

                  (i) A Holder of a Normal Unit who has so notified the Agent of
         its intention to make a Cash Settlement is required to pay the Purchase
         Price to the Collateral Agent

                                       36
<PAGE>

         prior to 11:00 a.m., New York City time, on the Business Day
         immediately preceding the Stock Purchase Date in lawful money of the
         United States by certified or cashiers' check or wire transfer, in each
         case in immediately available funds payable to or upon the order of the
         Company. Any cash received by the Collateral Agent will be paid to the
         Company on the Stock Purchase Date in settlement of the Purchase
         Contract in accordance with the terms of this Agreement and the Pledge
         Agreement.

                  (ii) If a Holder of a Normal Unit fails to notify the Agent of
         its intention to make a Cash Settlement in accordance with paragraph
         (a)(i) above, such failure shall constitute an event of default and the
         Holder shall be deemed to have consented to the disposition of the
         Pledged Notes pursuant to the remarketing as described in paragraph (b)
         below. If a Holder of a Normal Units does notify the Agent as provided
         in paragraph (a)(i) above of its intention to pay the Purchase Price in
         cash, but fails to make such payment as required by paragraph (a)(i)
         above, such failure shall also constitute an event of default; however,
         the Notes of such a Holder will not be remarketed but instead the
         Collateral Agent, for the benefit of the Company, will exercise its
         rights as a secured party with respect to such Notes, including but not
         limited to those rights specified in subsection (b)(iii) below.

         (b) (i) The Company has engaged _______________ (or any successor
thereto, the "Remarketing Agent") pursuant to the Remarketing Agreement to
remarket the Notes of Holders of Normal Units, other than Holders that have
elected not to participate in the remarketing pursuant to the procedures set
forth in clause (iv) below, and holders of Separate Notes that have elected to
participate in the remarketing pursuant to the procedures set forth in Section
4.5(d) of the Pledge Agreement. On the seventh Business Day prior to the first
day of a Remarketing Period, the Agent shall give Holders of Normal Units and
holders of Separate Notes notice of the remarketing in a daily newspaper in the
English language of general circulation in The City of New York, which is
expected to be The Wall Street Journal, including the specific U.S. Treasury
security or securities (including the CUSIP number and/or the principal terms of
such Treasury security or securities) described in clause (iv) below, that must
be delivered by Holders of Normal Units that elect not to participate in the
remarketing pursuant to clause (iv) below, no later than 10:00 a.m., New York
City time, on the fourth Business Day preceding the first day of a Remarketing
Period. The Company or the Agent, at the Company's request, shall request not
later than seven nor more than 15 calendar days prior to any Remarketing Period,
that the Clearing Agency notify the Clearing Agency Participants of such
Remarketing Period. The Agent shall notify, by 10:00 a.m., New York City time,
on the third Business Day preceding the first day of a Remarketing Period, the
Remarketing Agent and the Collateral Agent of the aggregate number of Notes of
Normal Unit Holders to be remarketed. On the third Business Day preceding the
first day of a Remarketing Period, no later than by 10:00 a.m. New York City
time, pursuant to the terms of the Pledge Agreement, the Custodial Agent will
notify the Remarketing Agent of the aggregate number of Separate Notes to be
remarketed. No later than 10:00 a.m., New York City time, on the Business Day
immediately preceding the first day of a Remarketing Period, the Collateral
Agent and the Custodial Agent, pursuant to the terms of the Pledge Agreement,
will deliver for remarketing to the Remarketing Agent all Notes to be
remarketed. Upon receipt of such notice from the Agent and the Custodial Agent
and such Notes from the Collateral Agent and the Custodial Agent, the
Remarketing Agent will, on the Remarketing Date, use commercially reasonable
best efforts to sell such Notes on such date at a price equal to at

                                       37
<PAGE>

least 100.__% of the Remarketing Value. The Remarketing Agent will use the
proceeds from a successful remarketing to purchase the appropriate U.S. Treasury
securities (the "Agent-purchased Treasury Consideration") with the CUSIP
numbers, if any, selected by the Remarketing Agent, described in clauses (i) and
(ii) of the definition of Remarketing Value related to the Notes of Holders of
Normal Units that were remarketed. On or prior to the third Business Day
following the Remarketing Date or any Subsequent Remarketing Date, the
Remarketing Agent shall deliver such Agent-purchased Treasury Consideration to
the Agent, which shall thereupon deliver such Agent-purchased Treasury
Consideration to the Collateral Agent. The Collateral Agent, for the benefit of
the Company, will thereupon apply such Agent-purchased Treasury Consideration,
in accordance with the Pledge Agreement, to secure such Holders' obligations
under the Purchase Contracts. In the event of a successful remarketing pursuant
to this Section 5.4, the Remarketing Agent will deduct as a remarketing fee an
amount not exceeding __ basis points (.__%) of the total proceeds from the
remarketing (the "Remarketing Fee"). The Remarketing Agent will remit (1) the
portion of the proceeds from the remarketing attributable to the Separate Notes
to the holders of Separate Notes that were remarketed and (2) the remaining
portion of the proceeds, less those proceeds used to purchase the
Agent-purchased Treasury Consideration, to the Holders of the Normal Units that
were remarketed, all determined on a pro rata basis, in each case, on or prior
to the third Business Day following the Remarketing Date or any Subsequent
Remarketing Date. Holders whose Notes are so remarketed will not otherwise be
responsible for the payment of any Remarketing Fee in connection therewith.

                  (i) If, in spite of using commercially reasonable best
efforts, the Remarketing Agent cannot remarket the Notes included in the
remarketing at a price equal to at least ____% of the Remarketing Value on the
Remarketing Date, the Remarketing Agent will use commercially reasonable best
efforts to establish a Remarketing Rate meeting these requirements on each of
the two immediately following Business Days. If the Remarketing Agent cannot
establish a Remarketing Rate meeting these requirements on either of those days,
it will use commercially reasonable efforts to establish such a Remarketing Rate
on each of the three Business Days immediately preceding _______________. If the
Remarketing Agent cannot establish such a Remarketing Rate either on any of the
two Business Days immediately following the Remarketing Date or on any of the
three Business Days immediately preceding _______________, the remarketing in
each such period will be deemed to have failed (each, a "Failed Remarketing").
If the Remarketing Agent cannot establish such a Remarketing Rate on any of the
three Business Days immediately preceding _______________, the Remarketing Agent
will further attempt to establish such a Remarketing Rate on the third Business
Day immediately preceding the Stock Purchase Date. If, in spite of using
commercially reasonable best efforts, the Remarketing Agent fails to remarket
the Notes underlying the Normal Units at a price equal to at least 100.__% of
the Remarketing Value in accordance with the terms of the Pledge Agreement by
4:00 p.m., New York City time, on the third Business Day immediately preceding
the Stock Purchase Date, the "Last Failed Remarketing" will be deemed to have
occurred. Within three Business Days following the date of a Failed Remarketing
or the Last Failed Remarketing, as the case may be, the Remarketing Agent shall
return any Notes delivered to it to the Collateral Agent and the Custodial
Agent, as applicable. The Collateral Agent, for the benefit of the Company, may
exercise its rights as a secured party with respect to such Notes, including
those actions specified in subsection (b)(iii) below; provided, that if upon the
Last Failed Remarketing, the Collateral Agent exercises such rights for the
benefit of the Company

                                       38
<PAGE>

with respect to such Notes, any accumulated and unpaid interest on such Notes
will become payable by the Company to the Agent for payment to the Holder of the
Normal Units to which such Notes relate. Such payment will be made by the
Company on or prior to 11:00 a.m., New York City time, on the Stock Purchase
Date in lawful money of the United States by certified or cashier's check or
wire transfer in immediately available funds payable to or upon the order of the
Agent. The Company will cause a notice of any Failed Remarketing and of the Last
Failed Remarketing to be published on the fourth Business Day following each
Failed Remarketing and the Last Failed Remarketing, as the case may be, in a
daily newspaper in the English language of general circulation in The City of
New York, which is expected to be The Wall Street Journal. The Company will also
release this information by means of Bloomberg and Reuters newswire.

                  (ii) With respect to any Notes which constitute part of Normal
Units which are subject to the Last Failed Remarketing, the Collateral Agent for
the benefit of the Company reserves all of its rights as a secured party with
respect thereto and, subject to applicable law and Section 5.4(e) below, may,
among other things, retain such Notes in full satisfaction of the Holders'
obligations under the Purchase Contracts or sell such Notes in one or more
public or private sales or otherwise.

                  (iii) A Holder of Normal Units may elect not to participate in
the remarketing and retain the Notes underlying such Units by notifying the
Agent of such election and delivering the specific U.S. Treasury security or
securities (including the CUSIP number and/or the principal terms of such
security or securities) identified by the Agent that constitute the U.S.
Treasury securities described in clauses (i) and (ii) of the definition of
Remarketing Value relating to the retained Notes (as if only such Notes were
being remarketed) (the "Opt-out Treasury Consideration") to the Agent not later
than 10:00 a.m., New York City time, on the fourth Business Day prior to the
first day of a Remarketing Period. Upon receipt thereof by the Agent, the Agent
shall deliver such Opt-out Treasury Consideration to the Collateral Agent, which
will, for the benefit of the Company, thereupon apply such Opt-out Treasury
Consideration to secure such Holder's obligations under the Purchase Contracts.
On the first Business Day immediately preceding the first day of a Remarketing
Period, the Collateral Agent, pursuant to the terms of the Pledge Agreement,
will deliver the Pledged Notes of such Holder to the Agent. Within three
Business Days following the last day of a Remarketing Period, (A) if the
remarketing was successful, the Agent shall distribute such Notes to the Holders
thereof, and (B) if there was a Failed Remarketing, the Agent will deliver such
Notes to the Collateral Agent, which will, for the benefit of the Company,
thereupon apply such Notes to secure such Holders' obligations under the
Purchase Contract and return the Opt-out Treasury Consideration delivered by
such Holders to such Holders. A Holder that does not so deliver the Opt-out
Treasury Consideration or does not so notify the Agent of its election to not
participate in the remarketing pursuant to this clause (iv) shall be deemed to
have elected to participate in the remarketing.

         (c) Upon the maturity of the Pledged Treasury Securities underlying the
Stripped Units and the Pledged Treasury Consideration or Pledged Applicable
Ownership Interest in the Treasury Portfolio, as the case may be, underlying the
Normal Units, on the Stock Purchase Date, the Collateral Agent shall remit to
the Company an amount equal to the aggregate Purchase Price applicable to such
Units, as payment for the Common Stock issuable upon settlement thereof without
receiving any instructions from the Holders of such Units. In the event the
payments in respect of the Pledged Treasury Securities, Pledged Treasury
Consideration or

                                       39
<PAGE>

Pledged Applicable Ownership Interest in the Treasury Portfolio underlying a
Unit is in excess of the Purchase Price of the Purchase Contract being settled
thereby, the Collateral Agent will distribute such excess to the Agent for the
benefit of the Holder of such Unit when received.

         (d) Any distribution to Holders of excess funds and interest described
in Section 5.4 (b) and (c) above shall be payable at the Corporate Trust Office
or, at the option of the Holder or the holder of Separate Notes, as applicable,
by check mailed to the address of the Person entitled thereto at such address as
it appears on the Register or by wire transfer to an account appropriately
specified by the Holder or the holder of Separate Notes, as applicable.

         (e) The obligations of each Holder to pay the Purchase Price are
non-recourse obligations and except to the extent paid by Early Settlement or
Merger Early Settlement, are payable solely out of the proceeds of any
Collateral pledged to secure the obligations of the Holders and in no event will
Holders be liable for any deficiency between such proceeds and the Purchase
Price.

         (f) Notwithstanding anything to the contrary herein, the Company shall
not be obligated to issue any shares of Common Stock in respect of a Purchase
Contract or deliver any certificates therefor to the Holder of the related Unit
unless the Company shall have received payment in full of the aggregate Purchase
Price for the shares of Common Stock to be purchased thereunder by such Holder
in the manner herein set forth.

SECTION 5.5 ISSUANCE OF SHARES OF COMMON STOCK.

         Unless a Termination Event shall have occurred on or prior to the Stock
Purchase Date or an Early Settlement or a Merger Early Settlement shall have
occurred, on the Stock Purchase Date, upon the Company's receipt of payment in
full of the Purchase Price for the shares of Common Stock purchased by the
Holders pursuant to the foregoing provisions of this Article and subject to
Section 5.6(b), the Company shall issue and deposit with the Agent, for the
benefit of the Holders of the Outstanding Units, one or more certificates
representing the newly issued shares of Common Stock registered in the name of
the Agent (or its nominee) as custodian for the Holders (such certificates for
shares of Common Stock, together with any dividends or distributions for which
both a record date and payment date for such dividend or distribution has
occurred after the Stock Purchase Date, being hereinafter referred to as the
"Purchase Contract Settlement Fund") to which the Holders are entitled
hereunder. Subject to the foregoing, upon surrender of a Certificate to the
Agent on or after the Stock Purchase Date, together with settlement instructions
thereon duly completed and executed, the Holder of such Certificate shall be
entitled to receive in exchange therefor a certificate representing that number
of whole shares of Common Stock which such Holder is entitled to receive
pursuant to the provisions of this Article V (after taking into account all
Units then held by such Holder) together with cash in lieu of fractional shares
as provided in Section 5.12 and any dividends or distributions with respect to
such shares constituting part of the Purchase Contract Settlement Fund, but
without any interest thereon, and the Certificate so surrendered shall forthwith
be cancelled. Such shares shall be registered in the name of the Holder or the
Holder's designee as specified in the settlement instructions provided by the
Holder to the Agent. If any shares of Common Stock issued in respect of a
Purchase Contract are to be registered to a Person other than the Person in
whose name the Certificate evidencing such Purchase Contract is registered, no
such registration shall

                                       40
<PAGE>

be made unless the Person requesting such registration has paid any transfer and
other taxes required by reason of such registration in a name other than that of
the registered Holder of such Certificate or has established to the satisfaction
of the Company that such tax either has been paid or is not payable.

SECTION 5.6 ADJUSTMENT OF SETTLEMENT RATE.

         (a) Adjustments for Dividends, Distributions, Stock Splits, Etc.

                  (1) Stock Dividends. In case the Company shall pay or make a
dividend or other distribution on the Common Stock in Common Stock, the
Settlement Rate, in effect at the opening of business on the day following the
date fixed for the determination of stockholders entitled to receive such
dividend or other distribution shall be increased by dividing such Settlement
Rate by a fraction of which the numerator shall be the number of shares of
Common Stock outstanding at the close of business on the date fixed for such
determination and the denominator shall be the sum of such number of shares and
the total number of shares constituting such dividend or other distribution,
such increase to become effective immediately after the opening of business on
the day following the date fixed for such determination. For the purposes of
this paragraph (1), the number of shares of Common Stock at any time outstanding
shall not include shares held in the treasury of the Company but shall include
any shares issuable in respect of any scrip certificates issued in lieu of
fractions of shares of Common Stock. The Company will not pay any dividend or
make any distribution on shares of Common Stock held in the treasury of the
Company.

                  (2) Stock Purchase Rights. In case the Company shall issue
rights, options or warrants to all holders of its Common Stock (that are not
available on an equivalent basis to Holders of the Units upon settlement of the
Purchase Contracts underlying such Units) entitling them to subscribe for or
purchase shares of Common Stock at a price per share less than the Current
Market Price per share of the Common Stock on the date fixed for the
determination of stockholders entitled to receive such rights, options or
warrants (other than pursuant to any dividend reinvestment, share purchase or
similar plan), the Settlement Rate in effect at the opening of business on the
day following the date fixed for such determination shall be increased by
dividing such Settlement Rate by a fraction, the numerator of which shall be the
number of shares of Common Stock outstanding at the close of business on the
date fixed for such determination plus the number of shares of Common Stock
which the aggregate of the offering price of the total number of shares of
Common Stock so offered for subscription or purchase would purchase at such
Current Market Price and the denominator of which shall be the number of shares
of Common Stock outstanding at the close of business on the date fixed for such
determination plus the number of shares of Common Stock so offered for
subscription or purchase, such increase to become effective immediately after
the opening of business on the day following the date fixed for such
determination. For the purposes of this paragraph (2), the number of shares of
Common Stock at any time outstanding shall not include shares held in the
treasury of the Company but shall include any shares issuable in respect of any
scrip certificates issued in lieu of fractions of shares of Common Stock. The
Company shall not issue any such rights, options or warrants in respect of
shares of Common Stock held in the treasury of the Company.

                                       41
<PAGE>

                  (3) Stock Splits; Reverse Splits. In case outstanding shares
of Common Stock shall be subdivided or split into a greater number of shares of
Common Stock, the Settlement Rate in effect at the opening of business on the
day following the day upon which such subdivision or split becomes effective
shall be proportionately increased, and, conversely, in case outstanding shares
of Common Stock shall each be combined into a smaller number of shares of Common
Stock, the Settlement Rate in effect at the opening of business on the day
following the day upon which such combination becomes effective shall be
proportionately reduced, such increase or reduction, as the case may be, to
become effective immediately after the opening of business on the day following
the day upon which such subdivision, split or combination becomes effective.

                  (4) Debt or Asset Distributions. (i) In case the Company
shall, by dividend or otherwise, distribute to all holders of its Common Stock
evidences of its indebtedness or assets (including securities, but excluding any
rights or warrants referred to in paragraph (2) of this Section, any dividend or
distribution paid exclusively in cash and any dividend, shares of capital stock
of any class or series, or similar equity interests, of or relating to a
subsidiary or other business unit in the case of a Spin-Off referred to in the
next paragraph, or dividend or other distribution referred to in paragraph (1)
of this Section), the Settlement Rate shall be adjusted so that the same shall
equal the rate determined by dividing the Settlement Rate in effect immediately
prior to the close of business on the date fixed for the determination of
stockholders entitled to receive such distribution by a fraction, the numerator
of which shall be the Current Market Price per share of the Common Stock on the
date fixed for such determination less the then fair market value (as determined
by the Board of Directors, whose determination shall be conclusive and described
in a Board Resolution) of the portion of the assets or evidences of indebtedness
so distributed applicable to one share of Common Stock and the denominator of
which shall be such Current Market Price per share of the Common Stock, such
adjustment to become effective immediately prior to the opening of business on
the day following the date fixed for the determination of stockholders entitled
to receive such distribution. In any case in which this paragraph (4) is
applicable, paragraphs (1) and (2) of this Section shall not be applicable.

                  (ii) In the case of a Spin-Off, the Settlement Rate in effect
immediately before the close of business on the record date fixed for
determination of stockholders entitled to receive that distribution will be
increased by multiplying the Settlement Rate by a fraction, the numerator of
which is the Current Market Price per share of the Common Stock plus the Fair
Market Value of the portion of those shares of Capital Stock or similar equity
interests so distributed applicable to one share of Common Stock and the
denominator of which is the Current Market Price per share of the Common Stock.
Any adjustment to the settlement rate under this paragraph 4(ii) will occur on
the date that is the earlier of (1) the tenth Trading Day following the
effective date of the Spin-Off and (2) the date of the securities being offered
in the Initial Public Offering of the Spin-Off, if that Initial Public Offering
is effected simultaneously with the Spin-Off.

                  (5) Cash Distributions. In case the Company shall, (i) by
dividend or otherwise, distribute to all holders of its Common Stock cash
(excluding any cash that is distributed in a Reorganization Event to which
Section 5.6(b) applies or as part of a distribution referred to in paragraph (4)
of this Section) in an aggregate amount that, when combined together

                                       42
<PAGE>

with (ii) the aggregate amount of any other distributions to all holders of its
Common Stock made exclusively in cash (other than regular quarterly cash
dividends) within the 12 months preceding the date of payment of such
distribution and in respect of which no adjustment pursuant to this paragraph
(5) or paragraph (6) of this Section has been made and (iii) the aggregate of
any cash plus the fair market value, as of the date of the expiration of the
tender or exchange offer referred to below (as determined by the Board of
Directors, whose determination shall be conclusive and described in a Board
Resolution), of consideration payable in respect of any tender or exchange offer
(other than consideration payable in respect of any odd lot tender offer) by the
Company or any of its subsidiaries for all or any portion of the Common Stock
concluded within the 12 months preceding the date of payment of the distribution
described in clause (i) above and in respect of which no adjustment pursuant to
this paragraph (5) or paragraph (6) of this Section has been made, exceeds ___%
of the product of the Current Market Price per share of the Common Stock on the
date for the determination of holders of shares of Common Stock entitled to
receive such distribution times the number of shares of Common Stock outstanding
on such date, then, and in each such case, immediately after the close of
business on such date for determination, the Settlement Rate shall be increased
so that the same shall equal the rate determined by dividing the Settlement Rate
in effect immediately prior to the close of business on the date fixed for
determination of the stockholders entitled to receive such distribution by a
fraction (A) the numerator of which shall be equal to the Current Market Price
per share of the Common Stock on the date fixed for such determination less an
amount equal to the quotient of (x) the combined amount distributed or payable
in the transactions described in clauses (i), (ii) and (iii) above and (y) the
number of shares of Common Stock outstanding on such date for determination and
(B) the denominator of which shall be equal to the Current Market Price per
share of the Common Stock on such date for determination.

                  (6) Tender Offers. In case (i) a tender or exchange offer made
by the Company or any subsidiary of the Company for all or any portion of the
Common Stock shall expire and such tender or exchange offer (as amended upon the
expiration thereof) shall require the payment to stockholders (based on the
acceptance (up to any maximum specified in the terms of the tender or exchange
offer) of Purchased Shares (as defined below)) of an aggregate consideration
having a fair market value (as determined by the Board of Directors, whose
determination shall be conclusive and described in a Board Resolution) that when
combined together with (ii) the aggregate of the cash plus the fair market value
(as determined by the Board of Directors, whose determination shall be
conclusive and described in a Board Resolution), as of the expiration of such
tender or exchange offer (other than consideration payable in respect of any odd
lot tender offer), of consideration payable in respect of any other tender or
exchange offer, by the Company or any subsidiary of the Company for all or any
portion of the Common Stock expiring within the 12 months preceding the
expiration of such tender or exchange offer and in respect of which no
adjustment pursuant to paragraph (5) of this Section or this paragraph (6) has
been made and (iii) the aggregate amount of any distributions to all holders of
the Company's Common Stock made exclusively in cash (other than regular
quarterly cash dividends) within the 12 months preceding the expiration of such
tender or exchange offer and in respect of which no adjustment pursuant to
paragraph (5) of this Section or this paragraph (6) has been made, exceeds ___%
of the product of the Current Market Price per share of the Common Stock as of
the last time (the "Expiration Time") tenders could have been made pursuant to
such tender or exchange offer (as it may be amended) times the number of shares
of Common Stock outstanding (including any tendered shares) on the Expiration
Time,

                                       43
<PAGE>

then, and in each such case, immediately prior to the opening of business on the
day after the date of the Expiration Time, the Settlement Rate shall be adjusted
so that the same shall equal the rate determined by dividing the Settlement Rate
immediately prior to the close of business on the date of the Expiration Time by
a fraction (A) the numerator of which shall be equal to (x) the product of (I)
the Current Market Price per share of the Common Stock on the date of the
Expiration Time and (II) the number of shares of Common Stock outstanding
(including any tendered shares) on the Expiration Time less (y) the amount of
cash plus the fair market value (determined as aforesaid) of the aggregate
consideration payable to stockholders based on the transactions described in
clauses (i), (ii) and (iii) above (assuming in the case of clause (i) the
acceptance, up to any maximum specified in the terms of the tender or exchange
offer, of Purchased Shares), and (B) the denominator of which shall be equal to
the product of (x) the Current Market Price per share of the Common Stock as of
the Expiration Time and (y) the number of shares of Common Stock outstanding
(including any tendered shares) as of the Expiration Time less the number of all
shares validly tendered and not withdrawn as of the Expiration Time (the shares
deemed so accepted, up to any such maximum, being referred to as the "Purchased
Shares").

                  (7) Reclassification. The reclassification of Common Stock
into securities including securities other than Common Stock (other than any
reclassification upon a Reorganization Event to which Section 5.6(b) applies)
shall be deemed to involve (i) a distribution of such securities other than
Common Stock to all holders of Common Stock (and the effective date of such
reclassification shall be deemed to be "the date fixed for the determination of
stockholders entitled to receive such distribution" and "the date fixed for such
determination" within the meaning of paragraph (4) of this Section), and (ii) a
subdivision, split or combination, as the case may be, of the number of shares
of Common Stock outstanding immediately prior to such reclassification into the
number of shares of Common Stock outstanding immediately thereafter (and the
effective date of such reclassification shall be deemed to be "the day upon
which such subdivision or split becomes effective" or "the day upon which such
combination becomes effective", as the case may be, and "the day upon which such
subdivision, split or combination becomes effective" within the meaning of
paragraph (3) of this Section).

                  (8) Current Market Price. The "Current Market Price" per share
of the Common Stock means (a) on any day the average of the Closing Prices for
the five consecutive Trading Days selected by the Company commencing not more
than 20 Trading Days before, and ending not later than, the earlier of the day
preceding the day in question and the day before the "ex date" with respect to
the issuance or distribution requiring such computation, (b) in the case of any
Spin-Off that is effected simultaneously with an Initial Public Offering of the
securities being distributed in the Spin-Off, the Closing Price of the Common
Stock on the Trading Day on which the initial public offering price of the
securities being distributed in the Spin-Off is determined, and (c) in the case
of any other Spin-Off, the average of the Closing Prices of the Common Stock
over the first 10 Trading Days after the effective date of such Spin-Off. For
purposes of this paragraph, the term "ex date," when used with respect to any
issuance or distribution, shall mean the first date on which the Common Stock
trades regular way on such exchange or in such market without the right to
receive such issuance or distribution.

                                       44
<PAGE>

                  (9) Calculation of Adjustments. All adjustments to the
Settlement Rate shall be calculated to the nearest 1/10,000th of a share of
Common Stock (or if there is not a nearest 1/10,000th of a share to the next
lower 1/10,000th of a share). No adjustment in the Settlement Rate shall be
required unless such adjustment would require an increase or decrease of at
least one percent therein; provided, however, that any adjustments which by
reason of this subparagraph are not required to be made shall be carried forward
and taken into account in any subsequent adjustment. If an adjustment is made to
the Settlement Rate pursuant to paragraph (1), (2), (3), (4), (5), (6), (7) or
(10) of this Section 5.6(a), an adjustment shall also be made to the Applicable
Market Value solely to determine which of clauses (i), (ii) or (iii) of the
definition of Settlement Rate in Section 5.1(a) will apply on the Stock Purchase
Date. Such adjustment shall be made by multiplying the Applicable Market Value
by a fraction, the numerator of which shall be the Settlement Rate immediately
after such adjustment pursuant to paragraph (1), (2), (3), (4), (5), (6), (7) or
(10) of this Section 5.6(a) and the denominator of which shall be the Settlement
Rate immediately before such adjustment; provided, however, that if such
adjustment to the Settlement Rate is required to be made pursuant to the
occurrence of any of the events contemplated by paragraph (1), (2), (3), (4),
(5), (7) or (10) of this Section 5.6(a) during the period taken into
consideration for determining the Applicable Market Value, appropriate and
customary adjustments shall be made to the Settlement Rate.

                  (10) Increase of Settlement Rate. The Company may make such
increases in the Settlement Rate, in addition to those required by this Section,
as it considers to be advisable in order to avoid or diminish any income tax to
any holders of shares of Common Stock resulting from any dividend or
distribution of stock or issuance of rights or warrants to purchase or subscribe
for stock or from any event treated as such for income tax purposes or for any
other reasons.

         (b) Adjustment for Consolidation, Merger or Other Reorganization Event.

         In the event of

                  (1) any consolidation or merger of the Company with or into
another Person (other than a merger or consolidation in which the Company is the
continuing corporation and in which the Common Stock outstanding immediately
prior to the merger or consolidation is not exchanged for cash, securities or
other property of the Company or another corporation),

                  (2) any sale, transfer, lease or conveyance to another Person
of the property of the Company as an entirety or substantially as an entirety,

                  (3) any statutory exchange of securities of the Company with
another Person (other than in connection with a merger or acquisition), or

                  (4) any liquidation, dissolution or winding up of the Company
other than as a result of or after the occurrence of a Termination Event (any
such event, a "Reorganization Event"), each share of Common Stock covered by
each Purchase Contract forming a part of a Unit immediately prior to such
Reorganization Event shall, after such Reorganization Event, be converted for
purposes of the Purchase Contract into the kind and amount of securities, cash
and other property receivable in such Reorganization Event (without any interest
thereon, and

                                       45
<PAGE>

without any right to dividends or distribution thereon which have a record date
that is prior to the Stock Purchase Date) per share of Common Stock by a holder
of Common Stock that (i) is not a Person with which the Company consolidated or
into which the Company merged or which merged into the Company or to which such
sale or transfer was made, as the case may be (any such Person, a "Constituent
Person"), or an Affiliate of a Constituent Person to the extent such
Reorganization Event provides for different treatment of Common Stock held by
Affiliates of the Company and non-Affiliates, and (ii) failed to exercise his
rights of election, if any, as to the kind or amount of securities, cash and
other property receivable upon such Reorganization Event (provided that if the
kind or amount of securities, cash and other property receivable upon such
Reorganization Event is not the same for each share of Common Stock held
immediately prior to such Reorganization Event by other than a Constituent
Person or an Affiliate thereof and in respect of which such rights of election
shall not have been exercised ("Non-electing Share"), then for the purpose of
this Section the kind and amount of securities, cash and other property
receivable upon such Reorganization Event by each Non-electing Share shall be
deemed to be the kind and amount so receivable per share by a plurality of the
Non-electing Shares). On the Stock Purchase Date, the Settlement Rate then in
effect will be applied to the value on the Stock Purchase Date of such
securities, cash or other property.

         In the event of such a Reorganization Event, the Person formed by such
consolidation, merger or exchange or the Person which acquires the assets of the
Company or, in the event of a liquidation or dissolution of the Company, the
Company or a liquidating trust created in connection therewith, shall execute
and deliver to the Agent an agreement supplemental hereto providing that the
Holder of each Outstanding Unit shall have the rights provided by this Section
5.6. Such supplemental agreement shall provide for adjustments which, for events
subsequent to the effective date of such supplemental agreement, shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Section. The above provisions of this Section shall similarly apply to
successive Reorganization Events.

SECTION 5.7 NOTICE OF ADJUSTMENTS AND CERTAIN OTHER EVENTS.

         (a) Whenever the Settlement Rate is adjusted as herein provided, the
Company shall:

                  (i) forthwith compute the Settlement Rate in accordance with
         Section 5.6 and prepare and transmit to the Agent a Company Certificate
         setting forth the Settlement Rate, the method of calculation thereof in
         reasonable detail, and the facts requiring such adjustment and upon
         which such adjustment is based; and

                  (ii) as soon as practicable following the occurrence of an
         event that requires or permits an adjustment to the Settlement Rate
         pursuant to Section 5.6 (or if the Company is not aware of such
         occurrence, as soon as practicable after becoming so aware), provide a
         written notice to the Agent of the occurrence of such event and a
         statement setting forth in reasonable detail the method by which the
         adjustment to the Settlement Rate was determined and setting forth the
         adjusted Settlement Rate.

         (b) The Agent shall not at any time be under any duty or responsibility
to any Holder of Units to determine whether any facts exist which may require
any adjustment of the Settlement Rate, or with respect to the nature or extent
or calculation of any such adjustment

                                       46
<PAGE>

when made, or with respect to the method employed in making the same. The Agent
shall not be accountable with respect to the validity or value (or the kind or
amount) of any shares of Common Stock, or of any securities or property, which
may at the time be issued or delivered with respect to any Purchase Contract,
and the Agent makes no representation with respect thereto. The Agent shall not
be responsible for any failure of the Company to issue, transfer or deliver any
shares of Common Stock pursuant to a Purchase Contract or to comply with any of
the duties, responsibilities or covenants of the Company contained in this
Article.

SECTION 5.8 TERMINATION EVENT; NOTICE.

         The Purchase Contracts and all obligations and rights of the Company
and the Holders thereunder, including, without limitation, the rights of Holders
to receive accumulated Contract Adjustment Payments, if any, or any Deferred
Contract Adjustment Payments and obligations of the Holders to purchase Common
Stock, will immediately and automatically terminate, without the necessity of
any notice or action by any Holder, the Agent or the Company, if, on or prior to
the Stock Purchase Date, a Termination Event shall have occurred. Upon and after
the occurrence of a Termination Event, the Normal Units shall thereafter
represent the right to receive the Notes or the appropriate Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, forming a part of such Normal Units, and the Stripped Units shall
thereafter represent the right to receive the Treasury Securities forming a part
of such Stripped Units, in each case in accordance with the provisions of
Section 4.3 of the Pledge Agreement. Upon the occurrence of a Termination Event,
the Company shall promptly but in no event later than two Business Days
thereafter give written notice to the Agent, the Collateral Agent and to the
Holders, at their addresses as they appear in the Register.

SECTION 5.9 EARLY SETTLEMENT.

         (a) Subject to and upon compliance with the provisions of this Section
5.9, Purchase Contracts underlying Units having an aggregate Stated Amount equal
to $1,000 or an integral multiple thereof, may, at the option of the Holder
thereof, be settled early ("Early Settlement") on or prior to 10:00 a.m., New
York City time, on the seventh Business Day immediately preceding the Stock
Purchase Date. In order to exercise the right to effect Early Settlement with
respect to any Purchase Contracts, the Holder of the Certificate evidencing the
related Units shall deliver such Certificate to the Agent at the Corporate Trust
Office duly endorsed for transfer to the Company or in blank with the form of
"Election to Settle Early" on the reverse thereof duly completed and accompanied
by payment payable to the Company in immediately available funds in an amount
(the "Early Settlement Amount") equal to (A) the product of (i) the Stated
Amount of such Units multiplied by (ii) the number of Purchase Contracts with
respect to which the Holder has elected to effect Early Settlement, plus (B) if
such delivery is made with respect to any Purchase Contracts during the period
from close of business on any Record Date next preceding any Payment Date to the
opening of business on such Payment Date, an amount equal to the Contract
Adjustment Payments, if any, payable on such Payment Date with respect to such
Purchase Contracts; provided that no payment shall be required pursuant to
clause (B) of this sentence if the Company shall have elected to defer the
Contract Adjustment Payments which would otherwise be payable on such Payment
Date. Except as provided in the immediately preceding sentence and subject to
Section 5.2(d), no payment or adjustment shall be made upon Early Settlement of
any Purchase Contract on any Contract Adjustment Payments accrued on

                                       47
<PAGE>

such Purchase Contract or on account of any dividends on the Common Stock issued
upon such Early Settlement. If the foregoing requirements are first satisfied
with respect to Purchase Contracts underlying any Unit at or prior to 5:00 p.m.,
New York City time, on a Business Day, such day shall be the "Early Settlement
Date" with respect to such Unit and if such requirements are first satisfied
after 5:00 p.m., New York City time, on a Business Day or on a day that is not a
Business Day, the "Early Settlement Date" with respect to such Units shall be
the next succeeding Business Day.

         (b) Upon Early Settlement of any Purchase Contract by the Holder of the
related Units, the Company shall issue, and the Holder shall be entitled to
receive, ______ shares of Common Stock on account of such Purchase Contract (the
"Early Settlement Rate"). The Early Settlement Rate shall be adjusted in the
same manner and at the same time as the Settlement Rate is adjusted. As promptly
as practicable after Early Settlement of Purchase Contracts in accordance with
the provisions of this Section 5.9, the Company shall issue and shall deliver to
the Agent at the Corporate Trust Office a certificate or certificates for the
full number of shares of Common Stock issuable upon such Early Settlement
together with payment in lieu of any fraction of a share, as provided in Section
5.12.

         (c) No later than the third Business Day after the applicable Early
Settlement Date the Company shall cause (i) the shares of Common Stock issuable
upon Early Settlement of Purchase Contracts to be issued and delivered, and (ii)
the related Pledged Notes, Pledged Treasury Consideration or Pledged Applicable
Ownership Interest in the Treasury Portfolio, in the case of Normal Units, or
the related Pledged Treasury Securities, in the case of Stripped Units, to be
released from the Pledge by the Collateral Agent and transferred, in each case,
to the Agent for delivery to the Holder thereof or the Holder's designee.

         (d) Upon Early Settlement of any Purchase Contracts, and subject to
receipt of shares of Common Stock from the Company and the Pledged Notes,
Pledged Treasury Consideration, Pledged Applicable Ownership Interest in the
Treasury Portfolio, or Pledged Treasury Securities, as the case may be, from the
Collateral Agent, as applicable, the Agent shall, in accordance with the
instructions provided by the Holder thereof on the applicable form of Election
to Settle Early on the reverse of the Certificate evidencing the related Units,
(i) transfer to the Holder the Pledged Notes, Pledged Treasury Consideration,
Pledged Applicable Ownership Interest in the Treasury Portfolio, or Pledged
Treasury Securities, as the case may be, forming a part of such Units, and (ii)
deliver to the Holder a certificate or certificates for the full number of
shares of Common Stock issuable upon such Early Settlement together with payment
in lieu of any fraction of a share, as provided in Section 5.12.

         (e) In the event that Early Settlement is effected with respect to
Purchase Contracts underlying less than all the Units evidenced by a
Certificate, upon such Early Settlement the Company shall execute and the Agent
shall authenticate, countersign and deliver to the Holder thereof, at the
expense of the Company, a Certificate evidencing the Units as to which Early
Settlement was not effected.

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<PAGE>

SECTION 5.10 EARLY SETTLEMENT UPON CASH MERGER.

         (a) In the event of a merger or consolidation of the Company of the
type described in clause (1) of Section 5.6(b) in which the Common Stock
outstanding immediately prior to such merger or consolidation is exchanged for
consideration consisting of at least ___% cash or cash equivalents (any such
event a "Cash Merger"), then the Company (or the successor to the Company
hereunder) shall be required to offer the Holder of each Unit the right to
settle the Purchase Contract underlying such Unit prior to the Stock Purchase
Date ("Merger Early Settlement") as provided herein. On or before the fifth
Business Day after the consummation of a Cash Merger, the Company or, at the
request and expense of the Company, the Agent, shall give all Holders notice of
the occurrence of the Cash Merger and of the right of Merger Early Settlement
arising as a result thereof. The Company shall also deliver a copy of such
notice to the Agent and the Collateral Agent.

         Each such notice shall contain:

                  (i) the date, which shall be not less than 20 nor more than 30
         calendar days after the date of such notice, on which the Merger Early
         Settlement will be effected (the "Merger Early Settlement Date");

                  (ii) the date, which shall be on or one Business Day prior to
         the Merger Early Settlement Date, by which the Merger Early Settlement
         right must be exercised;

                  (iii) the Settlement Rate in effect as a result of such Cash
         Merger and the kind and amount of cash, securities and other property
         receivable by the Holder upon settlement of each Purchase Contract
         pursuant to Section 5.6(b);

                  (iv) a statement to the effect that all or a portion of the
         Purchase Price payable by the Holder to settle the Purchase Contract
         will be offset against the amount of cash so receivable upon exercise
         of Merger Early Settlement, as applicable; and

                  (v) the instructions a Holder must follow to exercise the
         Merger Early Settlement right.

         (b) To exercise a Merger Early Settlement right, a Holder shall deliver
to the Agent at the Corporate Trust Office at or before 5:00 p.m., New York City
time on the date specified in the notice, the Certificate(s) evidencing the
Units with respect to which the Merger Early Settlement right is being exercised
duly endorsed for transfer to the Company or in blank with the form of "Election
to Settle Early" on the reverse thereof duly completed and accompanied by
payment payable to the Company in immediately available funds in an amount equal
to the Early Settlement Amount less the amount of cash that otherwise would be
deliverable by the Company or its successor upon settlement of the Purchase
Contract in lieu of Common Stock pursuant to Section 5.6(b) and as described in
the notice to Holders (the "Merger Early Settlement Amount").

         (c) On the Merger Early Settlement Date, the Company shall deliver or
cause to be delivered (i) the net cash, securities and other property to be
received by such exercising Holder, equal to the Settlement Rate as adjusted
pursuant to Section 5.6, in respect of the number of

                                       49
<PAGE>

Purchase Contracts for which such Merger Early Settlement right was exercised,
and (ii) the related Pledged Notes, Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the Treasury Portfolio, in the case of Normal
Units, or Pledged Treasury Securities, in the case of Stripped Units, to be
released from the Pledge by the Collateral Agent and transferred, in each case,
to the Agent for delivery to the Holder thereof or its designee. In the event a
Merger Early Settlement right shall be exercised by a Holder in accordance with
the terms hereof, all references herein to Stock Purchase Date shall be deemed
to refer to such Merger Early Settlement Date.

         (d) Upon Merger Early Settlement of any Purchase Contracts, and subject
to receipt of such net cash, securities or other property from the Company and
the Pledged Notes, Pledged Treasury Consideration, Pledged Applicable Ownership
Interest in the Treasury Portfolio or Pledged Treasury Securities, as the case
may be, from the Collateral Agent, as applicable, the Agent shall, in accordance
with the instructions provided by the Holder thereof on the applicable form of
Election to Settle Early on the reverse of the Certificate evidencing the
related Units, (i) transfer to the Holder the Pledged Notes, Pledged Treasury
Consideration, Pledged Applicable Ownership Interest in the Treasury Portfolio,
or Pledged Treasury Securities, as the case may be, forming a part of such
Units, and (ii) deliver to the Holder such net cash, securities or other
property issuable upon such Merger Early Settlement together with payment in
lieu of any fraction of a share, as provided in Section 5.12.

         (e) In the event that Merger Early Settlement is effected with respect
to Purchase Contracts underlying less than all the Units evidenced by a
Certificate, upon such Merger Early Settlement the Company (or the successor to
the Company hereunder) shall execute and the Agent shall authenticate,
countersign and deliver to the Holder thereof, at the expense of the Company, a
Certificate evidencing the Units as to which Merger Early Settlement was not
effected.

SECTION 5.11 CHARGES AND TAXES.

         The Company will pay all stock transfer and similar taxes attributable
to the initial issuance and delivery of the shares of Common Stock pursuant to
the Purchase Contracts and in payment of any Deferred Contract Adjustment
Payments; provided, that the Company shall not be required to pay any such tax
or taxes which may be payable in respect of any exchange of or substitution for
a Certificate evidencing a Unit or any issuance of a share of Common Stock in a
name other than that of the registered Holder of a Certificate surrendered in
respect of the Units evidenced thereby, other than in the name of the Agent, as
custodian for such Holder, and the Company shall not be required to issue or
deliver such share certificates or Certificates unless and until the Person or
Persons requesting the transfer or issuance thereof shall have paid to the
Company the amount of such tax or shall have established to the satisfaction of
the Company that such tax has been paid.

SECTION 5.12 NO FRACTIONAL SHARES.

         No fractional shares or scrip representing fractional shares of Common
Stock shall be issued or delivered upon settlement on the Stock Purchase Date or
upon Early Settlement or Merger Early Settlement of any Purchase Contracts. If
Certificates evidencing more than one

                                       50
<PAGE>

Purchase Contract shall be surrendered for settlement at one time by the same
Holder, the number of full shares of Common Stock which shall be delivered upon
settlement shall be computed on the basis of the aggregate number of Purchase
Contracts evidenced by the Certificates so surrendered. Instead of any
fractional share of Common Stock which would otherwise be deliverable upon
settlement of any Purchase Contracts on the applicable Settlement Date or upon
Early Settlement or Merger Early Settlement, the Company, through the Agent,
shall make a cash payment in respect of such fractional shares in an amount
equal to the value of such fractional shares times the Applicable Market Value.
The Company shall provide the Agent from time to time with sufficient funds to
permit the Agent to make all cash payments required by this Section 5.12 in a
timely manner.

                                   ARTICLE VI.

                                    REMEDIES

SECTION 6.1 UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PURCHASE CONTRACT
            ADJUSTMENT PAYMENTS AND PURCHASE COMMON STOCK.

         The Holder of any Unit shall have the right, which is absolute and
unconditional,

         (a) subject to the right of the Company to defer payment thereof
pursuant to Section 5.3, and to the forfeiture of any Deferred Contract
Adjustment Payments upon Early Settlement pursuant to Section 5.9 or upon Merger
Early Settlement pursuant to Section 5.10 or upon the occurrence of a
Termination Event, to receive payment of each installment of the Contract
Adjustment Payments, if any, with respect to the Purchase Contract constituting
a part of such Unit on the respective Payment Date for such Unit and to
institute suit for the enforcement of such right to receive Contract Adjustment
Payments, and

         (b) to purchase Common Stock pursuant to the Purchase Contract
constituting a part of such Unit and to institute suit for the enforcement of
any such right to purchase Common Stock, and such rights shall not be impaired
without the consent of such Holder.

SECTION 6.2 RESTORATION OF RIGHTS AND REMEDIES.

         If any Holder has instituted any proceeding to enforce any right or
remedy under this Agreement and such proceeding has been discontinued or
abandoned for any reason, or has been determined adversely to such Holder, then
and in every such case, subject to any determination in such proceeding, the
Company and such Holder shall be restored severally and respectively to their
former positions hereunder and thereafter all rights and remedies of such Holder
shall continue as though no such proceeding had been instituted.

SECTION 6.3 RIGHTS AND REMEDIES CUMULATIVE.

         Except as otherwise provided with respect to the replacement or payment
of mutilated, destroyed, lost or stolen Certificates in Section 3.10(f), no
right or remedy herein conferred upon or reserved to the Holders is intended to
be exclusive of any other right or remedy, and every right and remedy shall, to
the extent permitted by law, be cumulative and in addition to every other right
and remedy given hereunder or now or hereafter existing at law or in equity or

                                       51
<PAGE>

otherwise. The assertion or employment of any right or remedy hereunder, or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

SECTION 6.4 DELAY OR OMISSION NOT WAIVER.

         No delay or omission of any Holder to exercise any right or remedy upon
a Default shall impair any such right or remedy or constitute a waiver of any
such right. Every right and remedy given by this Article or by law to the
Holders may be exercised from time to time, and as often as may be deemed
expedient, by such Holders.

SECTION 6.5 UNDERTAKING FOR COSTS.

         All parties to this Agreement agree, and each Holder of a Unit, by its
acceptance of such Unit shall be deemed to have agreed, that any court may in
its discretion require, in any suit for the enforcement of any right or remedy
under this Agreement, or in any suit against the Agent for any action taken,
suffered or omitted by it as Agent, the filing by any party litigant in such
suit of an undertaking to pay the costs of such suit, and that such court may in
its discretion assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in such suit, having due regard to the merits and
good faith of the claims or defenses made by such party litigant; provided that
the provisions of this Section shall not apply to any suit instituted by the
Company, to any suit instituted by the Agent, to any suit instituted by any
Holder, or group of Holders, holding in the aggregate more than ___% of the
Outstanding Units, or to any suit instituted by any Holder for the enforcement
of distributions on any Notes on any Purchase Contract on or after the
respective Payment Date therefor in respect of any Unit held by such Holder, or
for enforcement of the right to purchase shares of Common Stock under the
Purchase Contract constituting part of any Unit held by such Holder.

SECTION 6.6 WAIVER OF STAY OR EXTENSION LAWS.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the
performance of this Agreement; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such
law, but will suffer and permit the execution of every such power as though no
such law had been enacted.

                                  ARTICLE VII.

                                   THE AGENT

SECTION 7.1 CERTAIN DUTIES AND RESPONSIBILITIES.

         (a) Prior to a Default and after the curing or waiving of all such
Defaults that may have occurred,

                  (1) the Agent undertakes to perform, with respect to the
Units, such duties and only such duties as are specifically set forth in this
Agreement and no implied covenants or obligations shall be read into this
Agreement against the Agent; and

                                       52
<PAGE>

                  (2) the Agent may, with respect to the Units, conclusively
rely, as to the truth of the statements and the correctness of the opinions
expressed therein, in the absence of bad faith on the part of the Agent, upon
certificates or opinions furnished to the Agent and conforming to the
requirements of this Agreement; but in the case of any certificates or opinions
which by any provision hereof are specifically required to be furnished to the
Agent, the Agent shall be under a duty to examine the same to determine whether
or not they conform to the requirements of this Agreement.

         (b) No provision of this Agreement shall be construed to relieve the
Agent from liability for its own negligent action, its own negligent failure to
act, or its own willful misconduct, except that

                  (1) this subsection shall not be construed to limit the effect
         of subsection (a) of this Section;

                  (2) the Agent shall not be liable for any error of judgment
         made in good faith by a Responsible Officer, unless it shall be proved
         that the Agent was negligent in ascertaining the pertinent facts; and

                  (3) no provision of this Agreement shall require the Agent to
         expend or risk its own funds or otherwise incur any financial liability
         in the performance of any of its duties hereunder, or in the exercise
         of any of its rights or powers.

         (c) Whether or not therein expressly so provided, every provision of
this Agreement relating to the conduct or affecting the liability of or
affording protection to the Agent shall be subject to the provisions of this
Section.

         (d) The Agent is authorized to execute, deliver and perform the Pledge
Agreement in its capacity as Agent and to grant the Pledge. The Agent shall be
entitled to all of the rights, privileges, immunities and indemnities contained
in this Agreement with respect to any duties of the Agent under, or actions
taken by the Agent pursuant to, such Pledge Agreement and any Remarketing
Agreement entered into by the Agent to effectuate Section 5.4 hereof or Section
6.3 of the Pledge Agreement.

         (e) In case a Default has occurred (that has not been cured or waived),
and is actually known by a Responsible Officer of the Agent, the Agent shall
exercise such of the rights and powers vested in it by this Agreement, and use
the same degree of care and skill in its exercise thereof, as a prudent person
would exercise or use under the circumstances in the conduct of his or her own
affairs.

         (f) At the request of the Company, the Agent is authorized to execute
and deliver one or more Remarketing Agreements to, among other things,
effectuate Section 5.4

SECTION 7.2 NOTICE OF DEFAULT.

         Within 30 days after the occurrence of any Default by the Company
hereunder of which a Responsible Officer of the Agent has actual knowledge, the
Agent shall transmit by mail to the Company and the Holders of Units, as their
names and addresses appear in the Register, notice of

                                       53
<PAGE>

such Default hereunder, unless such Default shall have been cured or waived;
provided that, except for a Default in any payment obligation hereunder, the
Agent shall be protected in withholding such notice if and so long as a
Responsible Officer of the Agent in good faith determines that the withholding
of such notice is in the interests of the Holders of the Units.

SECTION 7.3 CERTAIN RIGHTS OF AGENT.

         Subject to the provisions of Section 7.1:

         (a) the Agent may conclusively rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document believed by it
to be genuine and to have been signed or presented by the proper party or
parties;

         (b) any request or direction of the Company mentioned herein shall be
sufficiently evidenced by a Company Certificate, Issuer Order or Issuer Request,
and any resolution of the Board of Directors of the Company may be sufficiently
evidenced by a Board Resolution;

         (c) whenever in the administration of this Agreement the Agent shall
deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Agent (unless other evidence be
herein specifically prescribed) may, in the absence of bad faith on its part,
rely upon a Company Certificate;

         (d) the Agent may consult with counsel of its selection and the advice
of such counsel or any Opinion of Counsel shall be full and complete
authorization and protection in respect of any action taken, suffered or omitted
by it hereunder in good faith and in reliance thereon;

         (e) the Agent shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document, but the Agent,
in its discretion, may make reasonable further inquiry or investigation into
such facts or matters related to the execution, delivery and performance of the
Purchase Contracts as it may see fit, and, if the Agent shall determine to make
such further inquiry or investigation, it shall be given a reasonable
opportunity to examine the books, records and premises of the Company,
personally or by agent or attorney;

         (f) the Agent may execute any of the powers hereunder or perform any
duties hereunder either directly or by or through agents or attorneys or an
Affiliate of the Agent and the Agent shall not be responsible for any misconduct
or negligence on the part of any agent or attorney or an Affiliate appointed
with due care by it hereunder;

         (g) the rights, privileges, protections, immunities and benefits given
to the Agent, including, without limitation, its right to be indemnified, are
extended to, and shall be enforceable by, the Agent in each of its capacities
hereunder;

         (h) the Agent shall be under no obligation to exercise any of the
rights or powers vested in it by this Agreement at the request or direction of
any of the Holders pursuant to this

                                       54
<PAGE>

Agreement, unless such Holders shall have offered to the Agent security or
indemnity satisfactory to the Agent against the costs, expenses and liabilities
which might be incurred by it in compliance with such request or direction; and

         (i) the Agent shall not be liable for any action taken, suffered, or
omitted to be taken by it in good faith and reasonably believed by it to be
authorized or within the discretion or rights or powers conferred upon it by
this Agreement.

SECTION 7.4 NOT RESPONSIBLE FOR RECITALS, ETC.

         The recitals contained herein and in the Certificates shall be taken as
the statements of the Company and the Agent assumes no responsibility for their
accuracy. The Agent makes no representations as to the validity or sufficiency
of either this Agreement or of the Units, or of the Pledge Agreement or the
Pledge. The Agent shall not be accountable for the use or application by the
Company of the proceeds in respect of the Purchase Contracts.

SECTION 7.5 MAY HOLD UNITS AND OTHER DEALINGS.

         Any Registrar or any other agent of the Company, or the Agent and its
Affiliates, in their individual or any other capacity, may become the owner or
pledgee of Units and may otherwise deal with the Company, the Collateral Agent
or any other Person with the same rights it would have if it were not Registrar
or such other agent, or the Agent. The Agent and its Affiliates may (without
having to account therefor to the Company or any Holder of Units or holder of
Separate Notes) accept deposits from, lend money to, make their investments in
and generally engage in any kind of banking, trust or other business with the
Company, any Holder of Units and any holder of Separate Notes (and any of their
respective subsidiaries or Affiliates) as if it were not acting as the Agent and
the Agent and their Affiliates may accept fees and other consideration from the
Company, any Holder of Units or any holder of Separate Notes without having to
account for the same to any such Person.

SECTION 7.6 MONEY HELD IN CUSTODY.

         Money held by the Agent in custody hereunder need not be segregated
from the Agent's other funds except to the extent required by law or provided
herein. The Agent shall be under no obligation to invest or pay interest on any
money received by it hereunder except as otherwise agreed in writing with the
Company.

SECTION 7.7 COMPENSATION AND REIMBURSEMENT.

         The Company agrees:

         (a) to pay to the Agent from time to time compensation for all services
rendered by it hereunder as shall be agreed in writing between the Company and
the Agent;

         (b) except as otherwise expressly provided herein, to reimburse the
Agent upon its request for all reasonable expenses, disbursements and advances
incurred or made by the Agent in accordance with any provision of this Agreement
(including the reasonable compensation and the reasonable expenses and
disbursements of its agents and counsel), except any such expense,

                                       55
<PAGE>

disbursement or advance as may be attributable to its negligence, willful
misconduct or bad faith; and

         (c) to indemnify the Agent and any predecessor Agent for, and to hold
it harmless against, any loss, liability or reasonable out-of-pocket expense
incurred without negligence, willful misconduct or bad faith on its part,
arising out of or in connection with the acceptance or administration of its
duties hereunder, including the costs and expenses (including reasonable fees
and expenses of counsel) of defending itself against any claim or liability in
connection with the exercise or performance of any of its powers or duties under
this Agreement. The Agent shall each promptly notify the Company of any third
party claim which may give rise to the indemnity hereunder and give the Company
the opportunity to participate in the defense of such claim with counsel
reasonably satisfactory to the indemnified party, and no such claim shall be
settled without the written consent of the Company, which consent shall not be
unreasonably withheld.

         "Agent" for purposes of this Section 7.7 shall include any predecessor
Agent; provided, however, that the negligence or bad faith of any Agent
hereunder shall not affect the rights of any other Agent hereunder.

         When the Agent incurs expenses or renders services in an action or
proceeding commenced pursuant to Section 4.3 of the Pledge Agreement upon the
occurrence of a Termination Event, the expenses (including the reasonable
charges and expenses of its counsel) and the compensation for the services are
intended to constitute expenses of administration under any applicable federal
or state bankruptcy, insolvency or other similar law.

         The provisions of this Section 7.7 shall survive the termination of
this Agreement and the Pledge Agreement.

SECTION 7.8 CORPORATE AGENT REQUIRED; ELIGIBILITY.

         There shall at all times be an Agent hereunder which shall be (i) not
an Affiliate of the Company and (ii) a corporation organized and doing business
under the laws of the United States of America, any State thereof or the
District of Columbia, authorized under such laws to exercise corporate trust
powers, having (or being a member of a bank holding company having) a combined
capital and surplus of at least $50,000,000 and subject to supervision or
examination by federal or state authority and having a Corporate Trust Office in
the Borough of Manhattan, The City of New York, if there be such a corporation,
qualified and eligible under this Article and willing to act on reasonable
terms. If such corporation publishes reports of condition at least annually,
pursuant to law or to the requirements of said supervising or examining
authority, then for the purposes of this Section, the combined capital and
surplus of such corporation shall be deemed to be its combined capital and
surplus as set forth in its most recent report of condition so published. If at
any time the Agent shall cease to be eligible in accordance with the provisions
of this Section, it shall resign immediately in the manner and with the effect
hereinafter specified in this Article.

                                       56
<PAGE>

SECTION 7.9 RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

         (a) No resignation or removal of the Agent and no appointment of a
successor Agent pursuant to this Article shall become effective until the
acceptance of appointment by the successor Agent in accordance with the
applicable requirements of Section 7.10.

         (b) The Agent may resign at any time by giving written notice thereof
to the Company 60 days prior to the effective date of such resignation. If the
instrument of acceptance by a successor Agent required by Section 7.10 shall not
have been delivered to the Agent within 30 days after the giving of such notice
of resignation, the resigning Agent may petition any court of competent
jurisdiction for the appointment of a successor Agent.

         (c) The Agent may be removed at any time by Act of the Holders of a
majority in number of the Outstanding Units delivered to the Agent and the
Company.

         (d) If at any time:

                  (1) the Agent fails to comply with Section 310(b) of the TIA,
after written request therefor by the Company or by any Holder who has been a
bona fide Holder of a Unit for at least six months; or

                  (2) the Agent shall cease to be eligible under Section 7.8 and
shall fail to resign after written request therefor by the Company or by any
such Holder; or

                  (3) the Agent shall become incapable of acting or shall be
adjudged bankrupt or insolvent or a receiver of the Agent or of its property
shall be appointed or any public officer shall take charge or control of the
Agent or of its property or affairs for the purpose of rehabilitation,
conservation or liquidation;

then, in any such case, (x) the Company by a Board Resolution may remove the
Agent, or (y) any Holder who has been a bona fide Holder of a Unit for at least
six months may, on behalf of himself and all others similarly situated, petition
any court of competent jurisdiction for the removal of the Agent and the
appointment of a successor Agent.

         (e) If the Agent shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the Corporate Trust Office of the Agent
for any cause, the Company, by a Board Resolution, shall promptly appoint a
successor Agent and shall comply with the applicable requirements of Section
7.10. If no successor Agent shall have been so appointed by the Company and
accepted appointment in the manner required by Section 7.10, the Agent or any
Holder who has been a bona fide Holder of a Unit for at least six months may, on
behalf of himself and all others similarly situated, petition any court of
competent jurisdiction for the appointment of a successor Agent.

         (f) The Company shall give, or shall cause such successor Agent to
give, notice of each resignation and each removal of the Agent and each
appointment of a successor Agent by mailing written notice of such event by
first-class mail, postage prepaid, to all Holders as their names and addresses
appear in the applicable Register. Each notice shall include the name of the
successor Agent and the address of its Corporate Trust Office.

                                       57
<PAGE>

         (g) If the Agent has or shall acquire any "conflicting interest" within
the meaning of Section 310(b) of the TIA, the Agent and the Company shall in all
respects comply with the provisions of Section 310(b) of the TIA.

SECTION 7.10 ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

         (a) In case of the appointment hereunder of a successor Agent, every
such successor Agent so appointed shall execute, acknowledge and deliver to the
Company and to the retiring Agent an instrument accepting such appointment, and
thereupon the resignation or removal of the retiring Agent shall become
effective and such successor Agent, without any further act, deed or conveyance,
shall become vested with all the rights, powers, agencies and duties of the
retiring Agent; but, on the request of the Company or the successor Agent, such
retiring Agent shall, upon payment of its charges, execute and deliver an
instrument transferring to such successor Agent all the rights, powers and
trusts of the retiring Agent and shall duly assign, transfer and deliver to such
successor Agent all property and money held by such retiring Agent hereunder.

         (b) Upon request of any such successor Agent, the Company shall execute
any and all instruments for more fully and certainly vesting in and confirming
to such successor Agent all such rights, powers and agencies referred to in
paragraph (a) of this Section.

         (c) No successor Agent shall accept its appointment unless at the time
of such acceptance such successor Agent shall be qualified and eligible under
this Article.

SECTION 7.11 MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS.

         Any Person into which the Agent may be merged or converted or with
which it may be consolidated, or any Person resulting from any merger,
conversion or consolidation to which the Agent shall be a party, or any Person
succeeding to all or substantially all the corporate trust business of the
Agent, shall be the successor of the Agent hereunder, provided such Person shall
be otherwise qualified and eligible under this Article, without the execution or
filing of any paper or any further act on the part of any of the parties hereto.
In case any Certificates shall have been authenticated and executed on behalf of
the Holders, but not delivered, by the Agent then in office, any successor by
merger, conversion or consolidation to such Agent shall adopt such
authentication and execution and deliver the Certificates so authenticated and
executed with the same effect as if such successor Agent had itself
authenticated and executed such Units.

SECTION 7.12 PRESERVATION OF INFORMATION; COMMUNICATIONS TO HOLDERS.

         (a) The Agent shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders received by the Agent in its
capacity as Registrar.

         (b) If three or more Holders (herein referred to as "Applicants") apply
in writing to the Agent, and furnish to the Agent reasonable proof that each
such applicant has owned a Unit for a period of at least six months preceding
the date of such application, and such application states that the applicants
desire to communicate with other Holders with respect to their rights under this
Agreement or under the Units and is accompanied by a copy of the form of proxy
or other communication which such applicants propose to transmit, then the Agent
shall mail to all

                                       58
<PAGE>

the Holders copies of the form of proxy or other communication which is
specified in such request, with reasonable promptness after a tender to the
Agent of the materials to be mailed and of payment, or provision for the
payment, of the reasonable expenses of such mailing.

SECTION 7.13 NO OBLIGATIONS OF AGENT.

         Except to the extent otherwise provided in this Agreement or the Pledge
Agreement, the Agent assumes no obligation and shall not be subject to any
liability under this Agreement, the Pledge Agreement or any Purchase Contract in
respect of the obligations of the Holder of any Unit thereunder. The Company
agrees, and each Holder of a Certificate, by such Holder's acceptance thereof,
shall be deemed to have agreed, that the Agent's execution of the Certificates
on behalf of the Holders shall be solely as agent and attorney-in-fact for the
Holders, and that the Agent shall have no obligation to perform such Purchase
Contracts on behalf of the Holders, except to the extent expressly provided in
Article V.

SECTION 7.14 TAX COMPLIANCE.

         (a) The Agent, on its own behalf and on behalf of the Company, will
comply with all applicable certification, information reporting and withholding
(including "backup" withholding) requirements imposed by applicable tax laws,
regulations or administrative practice with respect to (i) any payments made
with respect to the Units or (ii) the issuance, delivery, holding, transfer,
redemption or exercise of rights under the Units. Such compliance shall include,
without limitation, the preparation and timely filing of required returns and
the timely payment of all amounts required to be withheld to the appropriate
taxing authority or its designated agent.

         (b) The Agent shall comply with any written direction received from the
Company with respect to the application of such requirements to particular
payments or Holders or in other particular circumstances, and may for purposes
of this Agreement conclusively rely on any such direction in accordance with the
provisions of Section 7.1(a)(2).

         (c) The Agent shall maintain all appropriate records documenting
compliance with such requirements, and shall make such records available, on
written request, to the Company or its authorized representative within a
reasonable period of time after receipt of such request.

                                  ARTICLE VIII.

                             SUPPLEMENTAL AGREEMENTS

SECTION 8.1 SUPPLEMENTAL AGREEMENTS WITHOUT CONSENT OF HOLDERS.

         Without the consent of any Holders, the Company and the Agent, at any
time and from time to time, may enter into one or more agreements supplemental
hereto, in form satisfactory to the Company and the Agent, for any of the
following purposes:

         (a) to evidence the succession of another Person to the Company, and
the assumption by any such successor of the covenants of the Company herein and
in the Certificates; or

                                       59
<PAGE>

         (b) to add to the covenants of the Company for the benefit of the
Holders, or to surrender any right or power herein conferred upon the Company;
or

         (c) to evidence and provide for the acceptance of appointment hereunder
by a successor Agent; or

         (d) to make provision with respect to the rights of Holders pursuant to
the requirements of Section 5.6(b) or 5.10; or

         (e) to cure any ambiguity, to correct or supplement any provisions
herein which may be inconsistent with any other provisions herein, or to make
any other provisions with respect to such matters or questions arising under
this Agreement, provided such action shall not adversely affect the interests of
the Holders.

SECTION 8.2 SUPPLEMENTAL AGREEMENTS WITH CONSENT OF HOLDERS.

         (a) With the consent of the Holders of not less than a majority of the
outstanding Purchase Contracts voting together as one class, by Act of said
Holders delivered to the Company and the Agent, the Company, when authorized by
a Board Resolution, and the Agent may enter into an agreement or agreements
supplemental hereto for the purpose of modifying in any manner the terms of the
Purchase Contracts, or the provisions of this Agreement or the rights of the
Holders in respect of the Units; provided, however, that, except as contemplated
herein, no such supplemental agreement shall, without the consent of the Holder
of each Outstanding Unit affected thereby:

                  (1) change any Payment Date;

                  (2) change the amount or the type of Collateral required to be
Pledged to secure a Holder's obligations under the Purchase Contract, impair the
right of the Holder of any Purchase Contract to receive distributions on the
related Collateral (except for the rights of Holders of Normal Units to
substitute the Treasury Securities for the Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, or the rights of holders of Stripped Units to substitute Notes or
appropriate Treasury Consideration or Applicable Ownership Interest in the
Treasury Portfolio for the Pledged Treasury Securities) or otherwise materially
adversely affect the Holder's rights in or to such Collateral;

                  (3) reduce any Contract Adjustment Payments, if any, or any
Deferred Contract Adjustment Payment, or change any place where, or the coin or
currency in which, any Contract Adjustment Payment is payable or increase any
amounts payable by Holders in respect of the Units or decrease any other amounts
receivable by Holders in respect of the Units;

                  (4) impair the right to institute suit for the enforcement of
any Purchase Contract, any Contract Adjustment Payment, if any, or any Deferred
Contract Adjustment Payment, if any;

                  (5) reduce the number of shares of Common Stock to be
purchased pursuant to any Purchase Contract, increase the price to purchase
shares of Common Stock upon

                                       60
<PAGE>

settlement of any Purchase Contract, change the Stock Purchase Date or otherwise
materially adversely affect the Holder's rights under any Purchase Contract; or

                  (6) reduce the percentage of the outstanding Purchase
Contracts the consent of whose Holders is required for any such supplemental
agreement;

provided, that if any amendment or proposal referred to above would adversely
affect only the Normal Units or the Stripped Units, then only the affected class
of Holders as of the record date for the Holders entitled to vote thereon will
be entitled to vote on or consent to such amendment or proposal, and such
amendment or proposal shall not be effective except with the consent of Holders
of not less than a majority of such class; provided further, however, that no
such agreement, whether with or without the consent of Holders, shall affect
Section 3.16.

         (b) It shall not be necessary for any Act of Holders under this Section
to approve the particular form of any proposed supplemental agreement, but it
shall be sufficient if such Act shall approve the substance thereof.

SECTION 8.3 EXECUTION OF SUPPLEMENTAL AGREEMENTS.

         In executing, or accepting the additional agencies created by, any
supplemental agreement permitted by this Article or the modifications thereby of
the agencies created by this Agreement, the Agent shall be entitled to receive
and (subject to Section 7.1) shall be fully protected in relying upon, an
Officer's Certificate and Opinion of Counsel stating that the execution of such
supplemental agreement is authorized or permitted by this Agreement. The Agent
may, but shall not be obligated to, enter into any such supplemental agreement
which affects the Agent's own rights, duties or immunities under this Agreement
or otherwise.

SECTION 8.4 EFFECT OF SUPPLEMENTAL AGREEMENTS.

         Upon the execution of any supplemental agreement under this Article,
this Agreement shall be modified in accordance therewith, and such supplemental
agreement shall form a part of this Agreement for all purposes; and every Holder
of Certificates theretofore or thereafter authenticated, executed on behalf of
the Holders and delivered hereunder shall be bound thereby.

SECTION 8.5 REFERENCE TO SUPPLEMENTAL AGREEMENTS.

         Certificates authenticated, executed on behalf of the Holders and
delivered after the execution of any supplemental agreement pursuant to this
Article may, and shall if required by the Agent, bear a notation in form
approved by the Agent as to any matter provided for in such supplemental
agreement. If the Company shall so determine, new Certificates so modified as to
conform, in the opinion of the Agent and the Company, to any such supplemental
agreement may be prepared and executed by the Company and authenticated,
executed on behalf of the Holders and delivered by the Agent in exchange for
Outstanding Certificates.

                                       61
<PAGE>

                                   ARTICLE IX.

                    CONSOLIDATION, MERGER, SALE OR CONVEYANCE

SECTION 9.1 COVENANT NOT TO MERGE, CONSOLIDATE, SELL OR CONVEY PROPERTY EXCEPT
            UNDER CERTAIN CONDITIONS.

         The Company covenants that it will not (a) merge with or into or
consolidate with any other Person or (b) sell, assign, transfer, lease or convey
all or substantially all of its properties and assets to any Person or group of
affiliated Persons in one transaction or a series of related transactions,
unless (i) either the Company shall be the continuing entity, or the successor
(if other than the Company) shall be a Person, other than an individual,
organized and existing under the laws of the United States of America or a State
thereof or the District of Columbia and such corporation shall expressly assume
all the obligations of the Company under this Agreement, the Purchase Contracts,
the Remarketing Agreement and the Pledge Agreement by one or more supplemental
agreements in form reasonably satisfactory to the Agent and the Collateral
Agent, executed and delivered to the Agent and the Collateral Agent by such
Person, and (ii) the Company or such successor, as the case may be, shall not,
immediately after such merger or consolidation, or such sale, assignment,
transfer, lease or conveyance, be in default in the performance of any covenant
or condition hereunder, under any of the Purchase Contracts, under the
Remarketing Agreement, or under the Pledge Agreement.

SECTION 9.2 RIGHTS AND DUTIES OF SUCCESSOR ENTITY.

         (a) In case of any such consolidation, merger, sale, assignment,
transfer, lease or conveyance and upon any such assumption by a successor entity
in accordance with Section 9.1, such successor corporation shall succeed to and
be substituted for the Company with the same effect as if it had been named
herein as the Company. Such successor Person thereupon may cause to be signed,
and may issue either in its own name or in the name of the Company, any or all
of the Certificates evidencing Units issuable hereunder which theretofore shall
not have been signed by the Company and delivered to the Agent; and, upon the
order of such successor corporation, instead of the Company, and subject to all
the terms, conditions and limitations in this Agreement prescribed, the Agent
shall authenticate and execute on behalf of the Holders and deliver any
Certificates which previously shall have been signed and delivered by the
officers of the Company to the Agent for authentication and execution, and any
Certificate evidencing Units which such successor entity thereafter shall cause
to be signed and delivered to the Agent for that purpose. All the Certificates
so issued shall in all respects have the same legal rank and benefit under this
Agreement as the Certificates theretofore or thereafter issued in accordance
with the terms of this Agreement as though all of such Certificates had been
issued at the date of the execution hereof.

         (b) In case of any such consolidation, merger, sale, assignment,
transfer, lease or conveyance such change in phraseology and form (but not in
substance) may be made in the Certificates evidencing Units thereafter to be
issued as may be appropriate.

                                       62
<PAGE>

SECTION 9.3 OPINION OF COUNSEL GIVEN TO AGENT.

         The Agent, subject to Sections 7.1 and 7.3, shall receive an Opinion of
Counsel as conclusive evidence that any such consolidation, merger, sale,
assignment, transfer, lease or conveyance, and any such assumption, complies
with the provisions of this Article and that all conditions precedent to the
consummation of any such consolidation, merger, sale, assignment, transfer,
lease or conveyance have been met.

                                   ARTICLE X.

                                   COVENANTS

SECTION 10.1 PERFORMANCE UNDER PURCHASE CONTRACTS.

         The Company covenants and agrees for the benefit of the Holders from
time to time of the Units that it will duly and punctually perform its
obligations under the Purchase Contracts in accordance with the terms of the
Purchase Contracts and this Agreement.

SECTION 10.2 MAINTENANCE OF OFFICE OR AGENCY.

         (a) The Company will maintain in the Borough of Manhattan, The City of
New York an office or agency where Certificates may be presented or surrendered
for acquisition of shares of Common Stock upon settlement of the Purchase
Contracts on any Settlement Date and for transfer of Collateral upon occurrence
of a Termination Event, where Certificates may be surrendered for registration
of transfer or exchange, for a Collateral Substitution or re-establishment of
Normal Units and where notices and demands to or upon the Company in respect of
the Units and this Agreement may be served. The Company will give prompt written
notice to the Agent of the location, and any change in the location, of such
office or agency. If at any time the Company shall fail to maintain any such
required office or agency or shall fail to furnish the Agent with the address
thereof, such presentations, surrenders, notices and demands may be made or
served at the Corporate Trust Office, and the Company hereby appoints the Agent
as its agent to receive all such presentations, surrenders, notices and demands.

         (b) The Company may also from time to time designate one or more other
offices or agencies where Certificates may be presented or surrendered for any
or all such purposes and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner
relieve the Company of its obligation to maintain an office or agency in the
Borough of Manhattan, The City of New York for such purposes. The Company will
give prompt written notice to the Agent of any such designation or rescission
and of any change in the location of any such other office or agency. The
Company hereby designates as the place of payment for the Units the Corporate
Trust Office and appoints the Agent at its Corporate Trust Office as paying
agent in such city.

SECTION 10.3 COMPANY TO RESERVE COMMON STOCK.

         The Company shall at all times prior to the Stock Purchase Date reserve
and keep available, free from preemptive rights, out of its authorized but
unissued Common Stock the full

                                       63
<PAGE>

number of shares of Common Stock issuable against tender of payment in respect
of all Purchase Contracts constituting a part of the Units evidenced by
Outstanding Certificates.

SECTION 10.4 COVENANTS AS TO COMMON STOCK.

         The Company covenants that all shares of Common Stock which may be
issued against tender of payment in respect of any Purchase Contract
constituting a part of the Outstanding Units will, upon issuance, be duly
authorized, validly issued, fully paid and nonassessable.

                                   ARTICLE XI.

                               TRUST INDENTURE ACT

SECTION 11.1 TRUST INDENTURE ACT; APPLICATION.

         (a) This Agreement is subject to the provisions of the TIA that are
required or deemed to be part of this Agreement and shall, to the extent
applicable, be governed by such provisions; and

         (b) if and to the extent that any provision of this Agreement limits,
qualifies or conflicts with the duties imposed by Section 310 to 317, inclusive,
of the TIA, such imposed duties shall control.

SECTION 11.2 LISTS OF HOLDERS OF SECURITIES.

         (a) The Company shall furnish or cause to be furnished to the Agent (a)
semiannually, not later than __________ and __________ in each year, commencing
__________, a list, in such form as the Agent may reasonably require, of the
names and addresses of the Holders ("List of Holders") as of a date not more
than 15 days prior to the delivery thereof, and (b) at such other times as the
Agent may request in writing, within 30 days after the receipt by the Company of
any such request, a List of Holders as of a date not more than 15 days prior to
the time such list is furnished; provided that, the Company shall not be
obligated to provide such List of Holders at any time the List of Holders does
not differ from the most recent List of Holders given to the Agent by the
Company. The Agent may destroy any List of Holders previously given to it on
receipt of a new List of Holders.

         (b) The Agent shall comply with its obligations under Section 311(a) of
the TIA, subject to the provisions of Section 311(b) and Section 312(b) of the
TIA.

SECTION 11.3 REPORTS BY THE AGENT.

         Not later than __________ of each year, commencing __________ , ____,
the Agent shall provide to the Holders such reports, if any, as are required by
Section 313(a) of the TIA in the form and in the manner provided by Section
313(a) of the TIA. Such reports shall be as of the preceding __________. The
Agent shall also comply with the requirements of Sections 313(b), (c) and (d) of
the TIA.

                                       64
<PAGE>

SECTION 11.4 PERIODIC REPORTS TO AGENT.

         The Company shall provide to the Agent such documents, reports and
information as required by Section 314(a) (if any) and the compliance
certificate required by Section 314(a) of the TIA in the form, in the manner and
at the times required by Section 314(a) of the TIA.

SECTION 11.5 EVIDENCE OF COMPLIANCE WITH CONDITIONS PRECEDENT.

         The Company shall provide to the Agent such evidence of compliance with
any conditions precedent provided for in this Agreement as and to the extent
required by Section 314(c) of the TIA. Any certificate or opinion required to be
given by an officer pursuant to Section 314(c)(1) of the TIA may be given in the
form of a Company Certificate. Any opinion required to be given pursuant to
Section 314(c)(2) of the TIA may be given in the form of an Opinion of Counsel.

SECTION 11.6 DEFAULTS; WAIVER.

         The Holders of a majority of the outstanding Purchase Contracts voting
together as one class may, by vote or consent, on behalf of all of the Holders,
waive any past Default and its consequences, except a Default

         (a) any payment on any Unit, or

         (b) in respect of a provision hereof which under Section 8.2 cannot be
modified or amended without the consent of the Holder of each Outstanding Unit
affected.

Upon such waiver, any such Default shall cease to exist, and any Default arising
therefrom shall be deemed to have been cured, for every purpose of this
Agreement, but no such waiver shall extend to any subsequent or other Default or
impair any right consequent thereon.

SECTION 11.7 AGENT'S KNOWLEDGE OF DEFAULTS.

         The Agent shall not be deemed to have knowledge of any Default unless a
Responsible Officer shall have obtained written notice of such Default.

SECTION 11.8 CONFLICTING INTERESTS.

         The Indenture shall be deemed to be specifically described in this
Agreement for the purposes of clause (i) of the first proviso contained in
Section 310(b) of the TIA.

SECTION 11.9 DIRECTION OF AGENT.

         Sections 315(d)(3) and 316(a)(1)(A) of the TIA are hereby expressly
excluded from this Agreement, as permitted by the TIA.

                                       65
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                         PINNACLE WEST CAPITAL CORPORATION

                                         By:____________________________________
                                              Name:
                                              Title:

                                         _________________,
                                         as Purchase Contract Agent and Trustee

                                         By:____________________________________
                                              Name:
                                              Title:

                                       66
<PAGE>
\
                                                                       EXHIBIT A

                        FORM OF NORMAL UNITS CERTIFICATE

                       (Form of Global Certificate Legend)

         [THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
PURCHASE CONTRACT AGREEMENT (AS HEREINAFTER DEFINED) AND IS REGISTERED IN THE
NAME OF THE CLEARING AGENCY OR A NOMINEE THEREOF. THIS CERTIFICATE MAY NOT BE
EXCHANGED IN WHOLE OR IN PART FOR A CERTIFICATE REGISTERED, AND NO TRANSFER OF
THIS CERTIFICATE IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY
PERSON OTHER THAN SUCH CLEARING AGENCY OR A NOMINEE THEREOF, EXCEPT IN THE
LIMITED CIRCUMSTANCES DESCRIBED IN THE PURCHASE CONTRACT AGREEMENT.

         Unless this Certificate is presented by an authorized representative of
The Depository Trust Company (55 Water Street, New York, New York) to the
Company or its agent for registration of transfer, exchange or payment, and any
Certificate issued is registered in the name of Cede & Co., or such other name
as requested by an authorized representative of The Depository Trust Company,
and any payment hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY A PERSON IS WRONGFUL since the registered owner
hereof, Cede & Co., has an interest herein.]

                        PINNACLE WEST CAPITAL CORPORATION

                   (Form of Face of Normal Units Certificate)
                               ____% Normal Units
                             ($_____ Stated Amount)

No._____
CUSIP No. __________

Number of Normal Units_____

         This Normal Units Certificate certifies that ________ is the registered
Holder of the number of Normal Units set forth above. Each Normal Unit
represents (i) either (a) beneficial ownership by the Holder of one Note due
_______________ (the "Note") of Pinnacle West Capital Corporation, an Arizona
corporation (the "Company"), having a principal amount of $_______, subject to
the Pledge of such Note by such Holder pursuant to the Pledge Agreement, (b) if
the Note has been remarketed by the Remarketing Agent (or if the Holder has
elected not to have the Note remarketed by delivering the appropriate Treasury
Consideration specified by the Remarketing Agent), the appropriate Treasury
Consideration, subject to the Pledge of such Treasury Consideration by such
Holder pursuant to the Pledge Agreement, or (c) if a Tax Event Redemption has
occurred, the appropriate Applicable Ownership Interest in the Treasury
Portfolio subject to the Pledge of such Applicable Ownership Interest in the
Treasury Portfolio pursuant to the Pledge Agreement, and (ii) the rights and
obligations of the Holder under one Purchase Contract with the Company. All
capitalized terms used herein which are defined in the Purchase Contract
Agreement have the meaning set forth therein.

                                      A-1
<PAGE>

         Pursuant to the Pledge Agreement, the Note or the appropriate Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, forming a part of each Normal Unit evidenced hereby has been
pledged to the Collateral Agent, for the benefit of the Company, to secure the
obligations of the Holder under the Purchase Contract comprising a part of such
Normal Unit to purchase the Common Stock of the Company. Prior to the purchase
of shares of Common Stock under each Purchase Contract, such Purchase Contracts
shall not entitle the Holders of Normal Units Certificates to any of the rights
of a holder of shares of Common Stock, including, without limitation, the right
to vote or receive any dividends or other payments or to consent or to receive
notice as stockholders in respect of the meetings of stockholders or for the
election of directors of the Company or for any other matter, or any other
rights whatsoever as stockholders of the Company.

         The Pledge Agreement provides that all payments in respect of the
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio received by the Collateral Agent shall be
paid by the Collateral Agent by wire transfer in same day funds (i) in the case
of (A) quarterly cash distributions on Normal Units which include Pledged Notes,
Pledged Treasury Consideration or any Pledged Applicable Ownership Interest in
the Treasury Portfolio and (B) any payments in respect of the Notes, Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, that have been released from the Pledge pursuant to the Pledge
Agreement, to the Agent to the account designated by the Agent, no later than
10:00 a.m., New York City time, on the Business Day such payment is received by
the Collateral Agent (provided that in the event such payment is received by the
Collateral Agent on a day that is not a Business Day or after 9:00 a.m., New
York City time, on a Business Day, then such payment shall be made no later than
9:30 a.m., New York City time, on the next succeeding Business Day) and (ii) in
the case of payments in respect of any Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, to be paid upon settlement of such Holder's
obligations to purchase Common Stock under the Purchase Contract, to the Company
on the Stock Purchase Date (as defined herein) in accordance with the terms of
the Pledge Agreement, in full satisfaction of the respective obligations of the
Holders of the Normal Units of which such Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, are a part under the Purchase Contracts forming a
part of such Normal Units. Quarterly distributions on Normal Units which include
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, which are payable
quarterly in arrears on ______, ______, ______, and ______ each year, commencing
_______________ (a "Payment Date"), shall, subject to receipt thereof by the
Agent from the Collateral Agent, be paid to the Person in whose name this Normal
Units Certificate (or a Predecessor Normal Units Certificate) is registered at
the close of business on the Record Date for such Payment Date.

         Each Purchase Contract evidenced hereby, unless an Early Settlement has
occurred or a Merger Early Settlement has occurred, obligates the Holder of this
Normal Units Certificate to purchase, and the Company to sell, on
_______________ (the "Stock Purchase Date"), at a price equal to $______ (the
"Stated Amount"), a number of newly issued shares of Common Stock, no par value
("Common Stock"), of the Company, equal to the Settlement Rate, unless, on or
prior to the Stock Purchase Date, there shall have occurred a Termination Event
with respect to the Normal Units of which such Purchase Contract is a part, all
as provided in the Purchase Contract

                                      A-2
<PAGE>

Agreement and more fully described on the reverse hereof. The Purchase Price (as
defined herein) for the shares of Common Stock purchased pursuant to each
Purchase Contract evidenced hereby, if not paid earlier, shall be paid on the
Stock Purchase Date by application of payments received in respect of the
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, pledged to secure the
obligations of the Holder under such Purchase Contract in accordance with the
terms of the Pledge Agreement.

         Payments on the Notes or the appropriate Treasury Consideration or
Applicable Ownership Interest in the Treasury Portfolio, as the case may be,
will be payable at the office of the Agent in The City of New York, New York or,
at the option of the Company, by check mailed to the address of the Person
entitled thereto as such address appears on the Normal Units Register or by wire
transfer to an account specified by the Company.

         The Company shall pay on each Payment Date in respect of each Purchase
Contract forming part of a Normal Unit evidenced hereby an amount (the "Contract
Adjustment Payments") equal to ____% per year of the Stated Amount, computed on
the basis of a 360-day year of twelve 30-day months, subject to deferral at the
option of the Company as provided in the Purchase Contract Agreement and more
fully described on the reverse hereof (provided that if any date on which
Contract Adjustment Payments are to be made on the Purchase Contracts is not a
Business Day, then payment of such Contract Adjustment Payments payable on that
date will be made on the next succeeding day which is a Business Day, and no
interest or payment will be paid in respect of such delay, except that if such
next succeeding Business Day is in the next succeeding calendar year, then such
payment will be made on the immediately preceding Business Day). Such Contract
Adjustment Payments shall be payable to the Person in whose name this Normal
Units Certificate (or a Predecessor Normal Units Certificate) is registered at
the close of business on the Record Date for such Payment Date.

         Contract Adjustment Payments will be payable at the office of the Agent
in The City of New York, New York or, at the option of the Company, by check
mailed to the address of the Person entitled thereto as such address appears on
the Normal Units Register.

         Reference is hereby made to the further provisions set forth on the
reverse hereof, which further provisions shall for all purposes have the same
effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Agent by manual signature, this Normal Units Certificate shall not be
entitled to any benefit under the Pledge Agreement or the Purchase Contract
Agreement or be valid or obligatory for any purpose.

                                      A-3
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                                       PINNACLE WEST CAPITAL CORPORATION

                                       By:______________________________________
                                              Name:
                                              Title:

                                       HOLDER SPECIFIED ABOVE (as to obligations
                                       of such Holder under the Purchase
                                       Contracts evidenced hereby)

                                       By:_______________, not individually
                                          but solely as Attorney-in-Fact of such
                                          Holder

                                       By:______________________________________
                                              Name:
                                              Title:

                                      A-4
<PAGE>

                      AGENT'S CERTIFICATE OF AUTHENTICATION

         This is one of the Normal Units Certificates referred to in the
within-mentioned Purchase Contract Agreement.

Dated:                                 __________________,
                                       as Purchase Contract Agent and Trustee

                                       By:______________________________________
                                                 Authorized Signatory

                                      A-5
<PAGE>

                  (FORM OF REVERSE OF NORMAL UNITS CERTIFICATE)

         Each Purchase Contract evidenced hereby is governed by a Purchase
Contract Agreement, dated as of _______________ (as may be supplemented from
time to time, the "Purchase Contract Agreement"), between the Company and
_______________, as Purchase Contract Agent (including its successors
thereunder, herein called the "Agent"), to which the Purchase Contract Agreement
and supplemental agreements thereto reference is hereby made for a description
of the respective rights, limitations of rights, obligations, duties and
immunities thereunder of the Agent, the Company, and the Holders and of the
terms upon which the Normal Units Certificates are, and are to be, executed and
delivered.

         Each Purchase Contract evidenced hereby obligates the Holder of this
Normal Units Certificate to purchase, and the Company to sell, on the Stock
Purchase Date at a price equal to $__________ (the "Purchase Price"), a number
of shares of Common Stock of the Company equal to the Settlement Rate, unless,
on or prior to the Stock Purchase Date, there shall have occurred a Termination
Event or a Cash Settlement, Early Settlement or Merger Early Settlement with
respect to the Unit of which such Purchase Contract is a part. The "Settlement
Rate" is equal to (a) if the Applicable Market Value (as defined below) is equal
to or greater than $____ (the "Threshold Appreciation Price"), ______ shares of
Common Stock per Purchase Contract, (b) if the Applicable Market Value is less
than the Threshold Appreciation Price, but is greater than $____, the number of
shares of Common Stock per Purchase Contract equal to the Stated Amount divided
by the Applicable Market Value and (c) if the Applicable Market Value is less
than or equal to $____, ______ shares of Common Stock per Purchase Contract, in
each case subject to adjustment as provided in the Purchase Contract Agreement.
No fractional shares of Common Stock will be issued upon settlement of Purchase
Contracts, as provided in the Purchase Contract Agreement.

         The "Applicable Market Value" means the average of the Closing Price
per share of Common Stock on each of the 20 consecutive Trading Days ending on
the third Trading Day immediately preceding the Stock Purchase Date or, in the
event of a Cash Merger, the Cash Merger Date.

         The "Closing Price" of the Common Stock on any date of determination
means the closing sale price per share (or, if no closing sale price is
reported, the last reported sale price) of the Common Stock on the New York
Stock Exchange (the "NYSE") on such date or, if the Common Stock is not listed
for trading on the NYSE on any such date, as reported in the composite
transactions for the principal United States securities exchange on which the
Common Stock is so listed, or if the Common Stock is not so listed on a United
States national or regional securities exchange, as reported by The Nasdaq Stock
Market, or if the Common Stock is not so reported, the last quoted bid price for
the Common Stock in the over-the-counter market as reported by the National
Quotation Bureau or similar organization, or if such bid price is not available,
the market value of the Common Stock on such date as determined by a nationally
recognized independent investment banking firm retained by the Company for this
purpose.

         A "Trading Day" means a day on which the Common Stock (A) is not
suspended from trading on any national or regional securities exchange or
association or over-the-counter market

                                      A-6
<PAGE>

at the close of business and (B) has traded at least once on the national or
regional securities exchange or association or over-the-counter market that is
the primary market for the trading of the Common Stock at the close of business
on such day.

         Each Purchase Contract evidenced hereby may be settled prior to the
Stock Purchase Date through Cash Settlement, Early Settlement or Merger Early
Settlement, in accordance with the terms of the Purchase Contract Agreement.

         In accordance with the terms of the Purchase Contract Agreement, the
Holder of this Normal Units Certificate shall pay the Purchase Price for the
shares of Common Stock purchased pursuant to each Purchase Contract evidenced
hereby (i) by effecting a Cash Settlement, Early Settlement or Merger Early
Settlement, (ii) by application of payments received in respect of the Pledged
Treasury Consideration acquired from the proceeds of a remarketing of the
related Pledged Notes underlying the Normal Units represented by this Normal
Units Certificate as contemplated by Section 5.4 of the Purchase Contract
Agreement, (iii) if the Holder has elected not to participate in such
remarketing, by application of payments received in respect of the Pledged
Treasury Consideration deposited by such Holder in respect of such Purchase
Contract or (iv) if a Tax Event Redemption has occurred prior to the successful
remarketing of the Notes as contemplated by Section 5.4 of the Purchase Contract
Agreement, by application of payments received in respect of the Pledged
Applicable Ownership Interest in the Treasury Portfolio purchased by the
Collateral Agent on behalf of the Holder of this Normal Units Certificate. If,
as provided in the Purchase Contract Agreement, upon the occurrence of a Last
Failed Remarketing, the Collateral Agent, for the benefit of the Company,
exercises its rights as a secured creditor with respect to the Pledged Notes
related to this Normal Units Certificate, any accrued and unpaid interest on
such Pledged Notes will become payable by the Company to the Holder of this
Normal Units Certificate in the manner provided for in the Purchase Contract
Agreement.

         The Company shall not be obligated to issue any shares of Common Stock
in respect of a Purchase Contract or deliver any certificates therefor to the
Holder unless the Company shall have received payment in full of the aggregate
Purchase Price for the shares of Common Stock to be purchased thereunder in the
manner herein set forth.

         Under and subject to the terms of the Pledge Agreement and the Purchase
Contract Agreement, the Agent will be entitled to exercise the voting and any
other consensual rights pertaining to the Pledged Notes, but only to the extent
instructed by the Holders as described below. Upon receipt of notice of any
meeting at which holders of Notes are entitled to vote or upon the solicitation
of consents, waivers or proxies of holders of Notes, the Agent shall, as soon as
practicable thereafter, mail to the Holders of Normal Units a notice (a)
containing such information as is contained in the notice or solicitation, (b)
stating that each such Holder on the record date set by the Agent therefor
(which, to the extent possible, shall be the same date as the record date for
determining the holders of Notes entitled to vote) shall be entitled to instruct
the Agent as to the exercise of the voting rights pertaining to the Pledged
Notes constituting a part of such Holder's Normal Units and (c) stating the
manner in which such instructions may be given. Upon the written request of the
Holders of Normal Units on such record date, the Agent shall endeavor insofar as
practicable to vote or cause to be voted, in accordance with the instructions
set forth in such requests, the maximum number of Pledged Notes as to which any
particular

                                      A-7
<PAGE>

voting instructions are received. In the absence of specific instructions from
the Holder of a Normal Unit, the Agent shall abstain from voting the Pledged
Note evidenced by such Normal Unit.

         The Normal Units Certificates are issuable only in registered form and
only in denominations of a single Normal Unit and any integral multiple thereof.
The transfer of any Normal Units Certificate will be registered and Normal Units
Certificates may be exchanged as provided in the Purchase Contract Agreement.
The Normal Units Registrar may require a Holder, among other things, to furnish
appropriate endorsements and transfer documents permitted by the Purchase
Contract Agreement. No service charge shall be made for any such registration of
transfer or exchange of a Normal Units Certificate, but the Company and the
Agent may require payment from the Holder of a sum sufficient to cover any tax
or other governmental charge that may be imposed in connection with any
registration of transfer or exchange of Certificates, other than any exchanges
not involving any transfer as provided for in the Purchase Contract Agreement.
The Holder of a Normal Unit may substitute for the Pledged Notes, Pledged
Treasury Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, securing its obligations under the related
Purchase Contract Treasury Securities in accordance with the terms of the
Purchase Contract Agreement and the Pledge Agreement. From and after such
Collateral Substitution, the Unit for which such Pledged Treasury Securities
secures the Holder's obligation under the Purchase Contract shall be referred to
as a "Stripped Unit." A Holder that elects to substitute a Treasury Security for
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, thereby creating
Stripped Units, shall be responsible for any fees or expenses payable in
connection therewith. Except as provided in the Purchase Contract Agreement, for
so long as the Purchase Contract underlying a Normal Unit remains in effect,
such Normal Unit shall not be separable into its constituent parts, and the
rights and obligations of the Holder of such Normal Units in respect of the
Pledged Note, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, and the Purchase
Contract comprising such Normal Unit may be acquired, and may be transferred and
exchanged, only as a Normal Unit.

         A Holder of Stripped Units may reestablish Normal Units at any time
from and after the date of the Purchase Contract Agreement and on or prior to
the second Business Day immediately preceding the Stock Purchase Date by
depositing with the Collateral Agent Notes or the appropriate Treasury
Consideration or Applicable Ownership Interest in the Treasury Portfolio, as the
case may be, in exchange for the release of the Pledged Treasury Securities in
accordance with the terms of the Purchase Contract Agreement and the Pledge
Agreement.

         Subject to the next succeeding paragraph, the Company shall pay, on
each Payment Date, the Contract Adjustment Payments, if any, payable in respect
of each Purchase Contract to the Person in whose name the Normal Units
Certificate (or one or more Predecessor Normal Units Certificates) evidencing
such Purchase Contract is registered on the Normal Units Register at the close
of business on the Record Date next preceding such Payment Date. The Contract
Adjustment Payments, if any, will be payable at the Corporate Trust Office or,
at the option of the Company, by check mailed to the address of the Person
entitled thereto at such Person's address as it appears on the Normal Units
Register or by wire transfer to an account appropriately designated by a prior
written notice to such Person.

                                      A-8
<PAGE>

         The Company shall have the right, at any time prior to the Stock
Purchase Date, to defer the payment of any or all of the Contract Adjustment
Payments otherwise payable on any Payment Date, but only if the Company shall
give the Holders and the Agent written notice of its election to defer each such
Contract Adjustment Payments as provided in the Purchase Contract Agreement. Any
Contract Adjustment Payments so deferred shall, to the extent permitted by law,
accrue additional Contract Adjustment Payments thereon at the rate of ____% per
year (computed on the basis of a 360-day year of twelve 30-day months),
compounding on each succeeding Payment Date, until paid in full (such deferred
installments of Contract Adjustment Payments, if any, together with the
additional Contract Adjustment Payments, if any, accrued thereon, are referred
to herein as the "Deferred Contract Adjustment Payments"). Deferred Contract
Adjustment Payments, if any, shall be due on the next succeeding Payment Date
except to the extent that payment is deferred pursuant to the Purchase Contract
Agreement. No Contract Adjustment Payments may be deferred to a date that is
after the Stock Purchase Date and no such deferral period may end other than on
a Payment Date.

         In the event that the Company elects to defer the payment of Contract
Adjustment Payments on the Purchase Contracts until a Payment Date prior to the
Stock Purchase Date, then all Deferred Contract Adjustment Payments, if any,
shall be payable to the registered Holders as of the close of business on the
Record Date immediately preceding such Payment Date.

         The Company's obligations with respect to Contract Adjustment Payments
(including any accrued or Deferred Contract Adjustment Payments) will be
subordinate and junior in right of payment to the Company's obligations under
any Senior Indebtedness.

         In the event that the Company elects to defer the payment of Contract
Adjustment Payments on the Purchase Contracts until the Stock Purchase Date, the
Holder of this Normal Units Certificate will receive on the Stock Purchase Date
in lieu of a cash payment a number of shares of Common Stock (in addition to the
number of shares of Common Stock equal to the Settlement Rate) equal to (i) the
aggregate amount of Deferred Contract Adjustment Payments payable to the Holder
of this Normal Units Certificate divided by (ii) the Applicable Market Value.

         In the event the Company exercises its option to defer the payment of
Contract Adjustment Payments, then until the Deferred Contract Adjustment
Payments have been paid, the Company shall not, and will not permit any
subsidiary of the Company to, declare or pay dividends on, make distributions
with respect to, or redeem, purchase or acquire, or make a liquidation payment
with respect to, any of the Company's Capital Stock other than (i) purchases,
redemptions or acquisitions of shares of the Company's Capital Stock in
connection with any employment contract, benefit plan or other similar
arrangement with or for the benefit of employees, officers, directors or agents
or a stock purchase or dividend reinvestment plan, or the satisfaction by the
Company of its obligations pursuant to any contract or security outstanding on
the date the Company exercises its rights to defer the Contract Adjustment
Payments; (ii) as a result of a reclassification of the Company's Capital Stock
or the exchange or conversion of one class or series of the Company's Capital
Stock for another class or series of the Company's Capital Stock; (iii) the
purchase of fractional interests in shares of the Company's Capital Stock
pursuant to the conversion or exchange provisions of such Capital Stock or the
security being converted or exchanged; (iv) dividends or distributions in any
series
                                      A-9
<PAGE>

of the Company's Capital Stock (or rights to acquire Capital Stock) or
repurchases, acquisitions or redemptions of the Company's Capital Stock in
connection with the issuance or exchange of any series of the Company's Capital
Stock (or securities convertible into or exchangeable for shares of the
Company's Capital Stock); or (v) redemptions, exchanges or repurchases of any
rights outstanding under a shareholder rights plan or the declaration or payment
thereunder of a dividend or distribution of or with respect to rights in the
future.

         The Purchase Contracts and all obligations and rights of the Company
and the Holders thereunder, including, without limitation, the rights of Holders
to receive accumulated Contract Adjustment Payments, if any, or any Deferred
Contract Adjustment Payments and obligations of the Holders to purchase Common
Stock, will immediately and automatically terminate, without the necessity of
any notice or action by any Holder, the Agent or the Company, if, on or prior to
the Stock Purchase Date, a Termination Event shall have occurred. Upon and after
the occurrence of a Termination Event, the Collateral Agent shall release the
Pledged Notes, Pledged Treasury Consideration or Pledged Applicable Ownership
Interest in the Treasury Portfolio, as the case may be, from the Pledge in
accordance with the provisions of the Pledge Agreement. Upon the occurrence of a
Termination Event, the Company shall promptly but in no event later than two
Business Days thereafter give written notice to the Agent, the Collateral Agent
and to the Holders, at their addresses as they appear in the Normal Units
Register.

         Upon registration of transfer of this Normal Units Certificate, the
transferee shall be bound (without the necessity of any other action on the part
of such transferee, except as may be required by the Agent pursuant to the
Purchase Contract Agreement), under the terms of the Purchase Contract
Agreement, the Purchase Contracts evidenced hereby and the Pledge Agreement and
the transferor shall be released from the obligations under the Purchase
Contract Agreement, the Purchase Contracts evidenced by this Normal Units
Certificate and the Pledge Agreement. The Company covenants and agrees, and the
Holder, by its acceptance hereof, likewise covenants and agrees, to be bound by
the provisions of this paragraph.

         The Holder of this Normal Units Certificate, by its acceptance hereof,
irrevocably authorizes the Agent to enter into and perform the related Purchase
Contracts forming part of the Normal Units evidenced hereby on its behalf as its
attorney-in-fact (including the execution of Certificates on behalf of such
Holder), agrees to be bound by the terms and provisions thereof, covenants and
agrees to perform its obligations under such Purchase Contracts, consents to the
provisions of the Purchase Contract Agreement, irrevocably authorizes the Agent
to enter into and perform the Pledge Agreement on such Holder's behalf as
attorney-in-fact, and consents to and agrees to be bound by the Pledge of the
Notes, the appropriate Treasury Consideration or Applicable Ownership Interest
in the Treasury Portfolio, as the case may be, underlying this Normal Units
Certificate pursuant to the Pledge Agreement. The Holder further covenants and
agrees, that, to the extent and in the manner provided in the Purchase Contract
Agreement and the Pledge Agreement, but subject to the terms thereof, payments
in respect of the Pledged Notes, Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the Treasury Portfolio, as the case may be, to
be paid upon settlement of such Holder's obligations to purchase Common Stock
under the Purchase Contract, shall be paid on the Stock Purchase Date by the
Collateral Agent to the Company in satisfaction of such Holder's obligations
under such Purchase Contract and such Holder shall acquire no right, title or
interest in such payments. Each Holder of a Normal Unit, by acceptance thereof,
will be deemed expressly to have withheld

                                      A-10
<PAGE>

any consent to the assumption (i.e., affirmance) under Section 365 of the
Bankruptcy Code or otherwise, of the Purchase Contract by the Company, its
trustee in bankruptcy, any receiver, liquidator or person or entity performing
similar functions in the event that the Company becomes a debtor under the
Bankruptcy Code or subject to other similar state or federal law providing for
reorganization or liquidation.

         Each Holder of any Unit, and each Beneficial Owner thereof, by its
acceptance thereof or of its interest therein, further covenants and agrees to
treat (i) itself as the owner of the related Notes, Treasury Consideration,
Applicable Ownership Interest in the Treasury Portfolio or Treasury Securities,
as the case may be, and (ii) the Notes as indebtedness of the Company, in each
case, for United States federal, state and local income and franchise tax
purposes.

         Subject to certain exceptions, the provisions of the Purchase Contract
Agreement may be amended with the consent of the Holders of a majority of the
Purchase Contracts.

         The Purchase Contracts shall for all purposes be governed by and deemed
to be a contract under, and construed in accordance with, the laws of the State
of New York, without regard to conflicts of laws principles thereof.

         The Company, the Agent and its Affiliates and any agent of the Company
or the Agent, may treat the Person in whose name this Normal Units Certificate
is registered on the Normal Units Register as the owner of the Normal Units
evidenced hereby for the purpose of receiving quarterly payments on the Notes,
the Treasury Consideration or the Applicable Ownership Interest in the Treasury
Portfolio, as the case may be, receiving payments of Contract Adjustment
Payments, if any, and any Deferred Contract Adjustment Payments, performance of
the Purchase Contracts and for all other purposes whatsoever, whether or not any
payments in respect thereof shall be overdue and notwithstanding any notice to
the contrary, and neither the Company, the Agent, such Affiliates nor any agent
of the Company, the Agent or such Affiliates shall be affected by notice to the
contrary.

         Prior to the purchase of shares of Common Stock under each Purchase
Contract, such Purchase Contracts shall not entitle the Holder to any of the
rights of a holder of shares of Common Stock.

         A copy of the Purchase Contract Agreement is available for inspection
at the offices of the Agent.

                                      A-11
<PAGE>

                                  ABBREVIATIONS

         The following abbreviations, when used in the inscription on the face
of this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM  --             as tenants in common

UNIF GIFT MIN ACT  --   _________________ Custodian _____________________(Minor)

                        under Uniform Gifts to Minors Act _______________(State)

TEN ENT  --             as tenants by the entireties

JT TEN --               as joint tenants with right of survivorship and not as
                        tenants in common

Additional abbreviations may also be used though not in the above list.

                                   ASSIGNMENT

        FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
                                transfer(s) unto

________________________________________________________________________________
________________________________________________________________________________
      (Please insert Social Security or Taxpayer I.D. or other Identifying
                               Number of Assignee)

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(Please Print or Type Name and Address Including Postal Zip Code of Assignee)

the within Normal Units Certificates and all rights thereunder, hereby
irrevocably constituting and appointing

________________________________________________________________________________
attorney to transfer said Normal Units Certificates on the books of Pinnacle
West Capital Corporation with full power of substitution in the premises.

Dated: _________________               _________________________________________

                                                    Signature

                                       NOTICE: The signature to this assignment
                                       must correspond with the name as it
                                       appears upon the face of the within
                                       Normal Units Certificates in every
                                       particular, without alteration or
                                       enlargement or any change whatsoever.

Signature Guarantee:

_________________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      A-12
<PAGE>

                             SETTLEMENT INSTRUCTIONS

         The undersigned Holder directs that a certificate for shares of Common
Stock deliverable upon settlement on or after the Stock Purchase Date of the
Purchase Contracts underlying the number of Normal Units evidenced by this
Normal Units Certificate (after taking into account all Units then held by such
Holder) be registered in the name of, and delivered, together with a check in
payment for any fractional share, to the undersigned at the address indicated
below unless a different name and address have been indicated below. If shares
are to be registered in the name of a Person other than the undersigned, the
undersigned will pay any transfer tax payable incident thereto.

Dated:_____________________            _________________________________________
                                                     Signature

Signature Guarantee:___________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

If shares are to be registered in the                  REGISTERED HOLDER
name of and delivered to a Person
other than the Holder, please (i)
print such Person's name and
address and (ii) provide a guarantee
of your signature:

              PLEASE PRINT NAME AND ADDRESS OF REGISTERED HOLDER:

___________________________________    _________________________________________
              Name                                     Name

___________________________________    _________________________________________

___________________________________    _________________________________________

___________________________________    _________________________________________
              Address                                  Address

________________________________________________________________________________
         Social Security or other Taxpayer Identification Number, if any

                                      A-13
<PAGE>

                            ELECTION TO SETTLE EARLY

         The undersigned Holder of this Normal Units Certificate hereby
irrevocably exercises the option to effect Early Settlement in accordance with
the terms of the Purchase Contract Agreement with respect to the Purchase
Contracts underlying the number of Normal Units evidenced by this Normal Units
Certificate specified below. The option to effect Early Settlement may be
exercised only with respect to Purchase Contracts underlying Normal Units with
an aggregate Stated Amount equal to $1,000 or an integral multiple thereof. The
undersigned Holder directs that a certificate for shares of Common Stock
deliverable upon such Early Settlement (after taking into account all Units then
held by such Holder) be registered in the name of, and delivered, together with
a check in payment for any fractional share and any Normal Units Certificate
representing any Normal Units evidenced hereby as to which Early Settlement of
the related Purchase Contracts is not effected, to the undersigned at the
address indicated below unless a different name and address have been indicated
below. Pledged Notes, Pledged Treasury Consideration or the Pledged Applicable
Ownership Interest in the Treasury Portfolio, as the case may be, deliverable
upon such Early Settlement will be transferred in accordance with the transfer
instructions set forth below. If shares are to be registered in the name of a
Person other than the undersigned, the undersigned will pay any transfer tax
payable incident thereto.

Dated:_____________________            _________________________________________
                                                     Signature

Signature Guarantee:___________________

Number of Units evidenced hereby as to which Early Settlement of the related
Purchase Contracts is being elected:

If shares of Common Stock or Normal Units            REGISTERED HOLDER
Certificates are to be registered in the
name of and delivered to and Pledged Notes,
Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the
Treasury Portfolio, as the case may be, are
to be transferred to a Person other than the
Holder, please print such Person's name and
address:

               PLEASE PRINT NAME AND ADDRESS OF REGISTERED HOLDER:

___________________________________    _________________________________________
              Name                                     Name

___________________________________    _________________________________________

___________________________________    _________________________________________

___________________________________    _________________________________________
              Address                                  Address
___________________________________    _________________________________________

________________________________________________________________________________
         Social Security or other Taxpayer Identification Number, if any

Transfer instructions for Pledged Notes, Pledged Treasury Consideration or the
Pledged Applicable Ownership Interest in the Treasury Portfolio, as the case may
be, transferable upon Early Settlement or a Termination Event:

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

                                      A-14
<PAGE>

                    [TO BE ATTACHED TO GLOBAL CERTIFICATES]

            SCHEDULE OF INCREASES OR DECREASES IN GLOBAL CERTIFICATE

The following increases or decreases in this Global Certificate have been made:

<TABLE>
<CAPTION>
                                                                         STATED AMOUNT OF THE
                           AMOUNT OF DECREASE                             GLOBAL CERTIFICATE
                           IN STATED AMOUNT OF   AMOUNT OF INCREASE IN         FOLLOWING            SIGNATURE OF
                               THE GLOBAL         STATED AMOUNT OF THE       SUCH DECREASE      AUTHORIZED OFFICER OF
          DATE                 CERTIFICATE         GLOBAL CERTIFICATE         OR INCREASE               AGENT
-----------------------    -------------------   ---------------------   --------------------   ---------------------
<S>                        <C>                   <C>                     <C>                    <C>

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------

-----------------------    -------------------   ---------------------   --------------------   ---------------------
</TABLE>

                                      A-15
<PAGE>

                                                                       EXHIBIT B

                       FORM OF STRIPPED UNITS CERTIFICATE

                       (Form of Global Certificate Legend)

         [THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
PURCHASE CONTRACT AGREEMENT (AS HEREINAFTER DEFINED) AND IS REGISTERED IN THE
NAME OF THE CLEARING AGENCY OR A NOMINEE THEREOF. THIS CERTIFICATE MAY NOT BE
EXCHANGED IN WHOLE OR IN PART FOR A CERTIFICATE REGISTERED, AND NO TRANSFER OF
THIS CERTIFICATE IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY
PERSON OTHER THAN SUCH CLEARING AGENCY OR A NOMINEE THEREOF, EXCEPT IN THE
LIMITED CIRCUMSTANCES DESCRIBED IN THE PURCHASE CONTRACT AGREEMENT.

         Unless this Certificate is presented by an authorized representative of
The Depository Trust Company (55 Water Street, New York, New York) to the
Company or its agent for registration of transfer, exchange or payment, and any
Certificate issued is registered in the name of Cede & Co., or such other name
as requested by an authorized representative of The Depository Trust Company,
and any payment hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY A PERSON IS WRONGFUL since the registered owner
hereof, Cede & Co., has an interest herein.]

                        PINNACLE WEST CAPITAL CORPORATION

                  (Form of Face of Stripped Units Certificate)
                             ($_____ Stated Amount)

No.____
CUSIP No. __________
Number of Stripped Units_____

         This Stripped Units Certificate certifies that ________ is the
registered Holder of the number of Stripped Units set forth above. Each Stripped
Unit represents (i) a _____ undivided beneficial ownership interest in a
Treasury Security, subject to the Pledge of such interest in such Treasury
Security by the Holder pursuant to the Pledge Agreement, and (ii) the rights and
obligations of the Holder under one Purchase Contract with Pinnacle West Capital
Corporation, an Arizona corporation (the "Company"). All capitalized terms used
herein which are defined in the Purchase Contract Agreement have the meaning set
forth therein.

         Pursuant to the Pledge Agreement, the Treasury Security constituting
part of each Stripped Unit evidenced hereby has been pledged to the Collateral
Agent, for the benefit of the Company, to secure the obligations of the Holder
under the Purchase Contract comprising a part of such Stripped Unit to purchase
the Common Stock of the Company. Prior to the purchase of shares of Common Stock
under each Purchase Contract, such Purchase Contracts shall not entitle the
Holders of Normal Units Certificates to any of the rights of a holder of shares
of Common Stock, including, without limitation, the right to vote or receive any
dividends or other payments

                                      B-1
<PAGE>

or to consent or to receive notice as stockholders in respect of the meetings of
stockholders or for the election of directors of the Company or for any other
matter, or any other rights whatsoever as stockholders of the Company.

         Each Purchase Contract evidenced hereby, unless an Early Settlement has
occurred or a Merger Early Settlement has occurred, obligates the Holder of this
Stripped Units Certificate to purchase, and the Company to sell, on
_______________ (the "Stock Purchase Date"), at a price equal to $_________ (the
"Stated Amount"), a number of newly issued shares of Common Stock, $0.01 par
value per share ("Common Stock"), of the Company, equal to the Settlement Rate,
unless on or prior to the Stock Purchase Date, there shall have occurred a
Termination Event with respect to the Stripped Units of which such Purchase
Contract is a part, all as provided in the Purchase Contract Agreement and more
fully described on the reverse hereof. The Purchase Price (as defined herein)
for the shares of Common Stock purchased pursuant to each Purchase Contract
evidenced hereby, if not paid earlier, shall be paid on the Stock Purchase Date
by application of payments received in respect of the Pledged Treasury
Securities pledged to secure the obligations of the Holder under such Purchase
Contract in accordance with the terms of the Pledge Agreement.

         The Company shall pay on each Payment Date in respect of each Purchase
Contract forming part of a Stripped Unit evidenced hereby an amount (the
"Contract Adjustment Payments") equal to ____% per year of the Stated Amount,
computed on the basis of a 360-day year of twelve 30-day months, subject to
deferral at the option of the Company as provided in the Purchase Contract
Agreement and more fully described on the reverse hereof (provided that if any
date on which Contract Adjustment Payments are to be made on the Purchase
Contracts is not a Business Day, then payment of such Contract Adjustment
Payments payable on that date will be made on the next succeeding day which is a
Business Day, and no interest or payment will be paid in respect of such delay,
except that if such next succeeding Business Day is in the next succeeding
calendar year, then such payment will be made on the immediately preceding
Business Day). Such Contract Adjustment Payments shall be payable to the Person
in whose name this Stripped Units Certificate (or a Predecessor Stripped Units
Certificate) is registered at the close of business on the Record Date for such
Payment Date.

         Contract Adjustment Payments will be payable at the office of the Agent
in The City of New York, New York or, at the option of the Company, by check
mailed to the address of the Person entitled thereto as such address appears on
the Normal Units Register. Reference is hereby made to the further provisions
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Agent by manual signature, this Stripped Units Certificate shall not be
entitled to any benefit under the Pledge Agreement or the Purchase Contract
Agreement or be valid or obligatory for any purpose.

                                      B-2
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                                           PINNACLE WEST CAPITAL CORPORATION

                                           By:__________________________________
                                                Name:
                                                Title:

                                           HOLDER SPECIFIED ABOVE (as to
                                           obligations of such Holder under the
                                           Purchase Contracts evidenced hereby)

                                           By:  _______________, not
                                                individually but solely as
                                                Attorney-in-Fact of such Holder

                                           By:__________________________________
                                                Name:
                                                Title:

                                      B-3
<PAGE>

                      AGENT'S CERTIFICATE OF AUTHENTICATION

         This is one of the Stripped Units Certificates referred to in the
within-mentioned Purchase Contract Agreement.

Dated:                                     ____________________,
                                           as Purchase Contract Agent and
                                           Trustee

                                           By:__________________________________
                                                    Authorized Signatory

                                      B-4
<PAGE>

                 (FORM OF REVERSE OF STRIPPED UNITS CERTIFICATE)

         Each Purchase Contract evidenced hereby is governed by a Purchase
Contract Agreement, dated as of _______________ (as may be supplemented from
time to time, the "Purchase Contract Agreement"), between the Company and
_______________, as Purchase Contract Agent (including its successors
thereunder, herein called the "Agent"), to which the Purchase Contract Agreement
and supplemental agreements thereto reference is hereby made for a description
of the respective rights, limitations of rights, obligations, duties and
immunities thereunder of the Agent, the Company and the Holders and of the terms
upon which the Stripped Units Certificates are, and are to be, executed and
delivered.

         Each Purchase Contract evidenced hereby obligates the Holder of this
Stripped Units Certificate to purchase, and the Company to sell, on the Stock
Purchase Date at a price equal to $__________ (the "Purchase Price"), a number
of shares of Common Stock of the Company equal to the Settlement Rate, unless,
on or prior to the Stock Purchase Date, there shall have occurred a Termination
Event or a Cash Settlement, Early Settlement or Merger Early Settlement with
respect to the Unit of which such Purchase Contract is a part. The "Settlement
Rate" is equal to (a) if the Applicable Market Value (as defined below) is equal
to or greater than $____ (the "Threshold Appreciation Price"), ______ shares of
Common Stock per Purchase Contract, (b) if the Applicable Market Value is less
than the Threshold Appreciation Price, but is greater than $____, the number of
shares of Common Stock per Purchase Contract equal to the Stated Amount divided
by the Applicable Market Value and (c) if the Applicable Market Value is less
than or equal to $____, ______ shares of Common Stock per Purchase Contract, in
each case subject to adjustment as provided in the Purchase Contract Agreement.
No fractional shares of Common Stock will be issued upon settlement of Purchase
Contracts, as provided in the Purchase Contract Agreement.

         The "Applicable Market Value" means the average of the Closing Price
per share of Common Stock on each of the 20 consecutive Trading Days ending on
the third Trading Day immediately preceding the Stock Purchase Date or, in the
event of a Cash Merger, the Cash Merger Date.

         The "Closing Price" of the Common Stock on any date of determination
means the closing sale price per share (or, if no closing sale price is
reported, the last reported sale price) of the Common Stock on the New York
Stock Exchange (the "NYSE") on such date or, if the Common Stock is not listed
for trading on the NYSE on any such date, as reported in the composite
transactions for the principal United States securities exchange on which the
Common Stock is so listed, or if the Common Stock is not so listed on a United
States national or regional securities exchange, as reported by The Nasdaq Stock
Market, or if the Common Stock is not so reported, the last quoted bid price for
the Common Stock in the over-the-counter market as reported by the National
Quotation Bureau or similar organization, or if such bid price is not available,
the market value of the Common Stock on such date as determined by a nationally
recognized independent investment banking firm retained by the Company for this
purpose.

         A "Trading Day" means a day on which the Common Stock (A) is not
suspended from trading on any national or regional securities exchange or
association or over-the-counter market

                                      B-5
<PAGE>

at the close of business and (B) has traded at least once on the national or
regional securities exchange or association or over-the-counter market that is
the primary market for the trading of the Common Stock at the close of business
on such day.

         Each Purchase Contract evidenced hereby may be settled prior to the
Stock Purchase Date through Cash Settlement, Early Settlement or Merger Early
Settlement, in accordance with the terms of the Purchase Contract Agreement.

         In accordance with the terms of the Purchase Contract Agreement, the
Holder of this Stripped Units Certificate shall pay the Purchase Price for the
shares of Common Stock purchased pursuant to each Purchase Contract evidenced
hereby (i) by effecting a Cash Settlement, Early Settlement or Merger Early
Settlement or (ii) by application of payments received in respect of the Pledged
Treasury Securities underlying the Stripped Units represented by this Stripped
Units Certificate.

         The Company shall not be obligated to issue any shares of Common Stock
in respect of a Purchase Contract or deliver any certificates therefor to the
Holder unless the Company shall have received payment in full of the aggregate
Purchase Price for the shares of Common Stock to be purchased thereunder in the
manner herein set forth.

         The Stripped Units Certificates are issuable only in registered form
and only in denominations of a single Stripped Unit and any integral multiple
thereof. The transfer of any Stripped Units Certificate will be registered and
Stripped Units Certificates may be exchanged as provided in the Purchase
Contract Agreement. The Stripped Units Registrar may require a Holder, among
other things, to furnish appropriate endorsements and transfer documents
permitted by the Purchase Contract Agreement. No service charge shall be made
for any such registration of transfer or exchange of a Stripped Units
Certificate, but the Company and the Agent may require payment from the Holder
of a sum sufficient to cover any tax or other governmental charge that may be
imposed in connection with any registration of transfer or exchange of
Certificates, other than any exchanges not involving any transfer as provided
for in the Purchase Contract Agreement. The Holder of a Stripped Unit may
substitute for the Pledged Treasury Securities securing its obligations under
the related Purchase Contract Notes or the appropriate Treasury Consideration or
Applicable Ownership Interest in the Treasury Portfolio in accordance with the
terms of the Purchase Contract Agreement and the Pledge Agreement. From and
after such Collateral Substitution, the Unit for which such Pledged Notes,
Pledged Treasury Consideration or Pledged Applicable Ownership Interest in the
Treasury Portfolio secures the Holder's obligation under the Purchase Contract
shall be referred to as a "Normal Unit." A Holder that elects to substitute
Notes or the appropriate Treasury Consideration or Applicable Ownership Interest
in the Treasury Portfolio, as the case may be, for Pledged Treasury Securities,
thereby reestablishing Normal Units, shall be responsible for any fees or
expenses payable in connection therewith. Except as provided in the Purchase
Contract Agreement, for so long as the Purchase Contract underlying a Stripped
Unit remains in effect, such Stripped Unit shall not be separable into its
constituent parts, and the rights and obligations of the Holder of such Stripped
Unit in respect of the Pledged Treasury Security and the Purchase Contract
comprising such Stripped Unit may be acquired, and may be transferred and
exchanged, only as a Stripped Unit.

                                      B-6
<PAGE>

         A Holder of Normal Units may establish Stripped Units at any time from
and after the date of the Purchase Contract Agreement and on or prior to the
second Business Day immediately preceding the Stock Purchase Date by depositing
with the Collateral Agent Treasury Securities in exchange for the release of the
Pledged Notes or the appropriate Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the Treasury Portfolio, as the case may be, in
accordance with the terms of the Purchase Contract Agreement and the Pledge
Agreement.

         Subject to the next succeeding paragraph, the Company shall pay, on
each Payment Date, the Contract Adjustment Payments, if any, payable in respect
of each Purchase Contract to the Person in whose name the Stripped Units
Certificate (or one or more Predecessor Stripped Units Certificates) evidencing
such Purchase Contract is registered on the Stripped Units Register at the close
of business on the Record Date next preceding such Payment Date. The Contract
Adjustment Payments, if any, will be payable at the Corporate Trust Office or,
at the option of the Company, by check mailed to the address of the Person
entitled thereto at such Person's address as it appears on the Stripped Units
Register or by wire transfer to an account appropriately designated by a prior
written notice to such Person.

         The Company shall have the right, at any time prior to the Stock
Purchase Date, to defer the payment of any or all of the Contract Adjustment
Payments otherwise payable on any Payment Date, but only if the Company shall
give the Holders and the Agent written notice of its election to defer each such
Contract Adjustment Payments as provided in the Purchase Contract Agreement. Any
Contract Adjustment Payments so deferred shall, to the extent permitted by law,
accrue additional Contract Adjustment Payments thereon at the rate of ____% per
year (computed on the basis of a 360-day year of twelve 30-day months),
compounding on each succeeding Payment Date, until paid in full (such deferred
installments of Contract Adjustment Payments, if any, together with the
additional Contract Adjustment Payments, if any, accrued thereon, are referred
to herein as the "Deferred Contract Adjustment Payments"). Deferred Contract
Adjustment Payments, if any, shall be due on the next succeeding Payment Date
except to the extent that payment is deferred pursuant to the Purchase Contract
Agreement. No Contract Adjustment Payments may be deferred to a date that is
after the Stock Purchase Date and no such deferral period may end other than on
a Payment Date.

         In the event that the Company elects to defer the payment of Contract
Adjustment Payments on the Purchase Contracts until a Payment Date prior to the
Stock Purchase Date, then all Deferred Contract Adjustment Payments, if any,
shall be payable to the registered Holders as of the close of business on the
Record Date immediately preceding such Payment Date.

         The Company's obligations with respect to Contract Adjustment Payments
(including any accrued or Deferred Contract Adjustment Payments) will be
subordinate and junior in right of payment to the Company's obligations under
any Senior Indebtedness.

         In the event that the Company elects to defer the payment of Contract
Adjustment Payments on the Purchase Contracts until the Stock Purchase Date, the
Holder of this Stripped Units Certificate will receive on the Stock Purchase
Date in lieu of a cash payment a number of shares of Common Stock (in addition
to the number of shares of Common Stock equal to the Settlement Rate) equal to
(i) the aggregate amount of Deferred Contract Adjustment Payments

                                      B-7
<PAGE>

payable to the Holder of this Stripped Units Certificate divided by (ii) the
Applicable Market Value.

         In the event the Company exercises its option to defer the payment of
Contract Adjustment Payments, then, until the Deferred Contract Adjustment
Payments have been paid, the Company shall not, and will not permit any
subsidiary of the Company to, declare or pay dividends on, make distributions
with respect to, or redeem, purchase or acquire, or make a liquidation payment
with respect to, any of the Company's Capital Stock other than (i) purchases,
redemptions or acquisitions of shares of the Company's Capital Stock in
connection with any employment contract, benefit plan or other similar
arrangement with or for the benefit of employees, officers, directors or agents
or a stock purchase or dividend reinvestment plan, or the satisfaction by the
Company of its obligations pursuant to any contract or security outstanding on
the date the Company exercises its rights to defer the Contract Adjustment
Payments; (ii) as a result of a reclassification of the Company's Capital Stock
or the exchange or conversion of one class or series of the Company's Capital
Stock for another class or series of the Company's Capital Stock; (iii) the
purchase of fractional interests in shares of the Company's Capital Stock
pursuant to the conversion or exchange provisions of such Capital Stock or the
security being converted or exchanged; (iv) dividends or distributions in any
series of the Company's Capital Stock (or rights to acquire Capital Stock) or
repurchases, acquisitions or redemptions of the Company's Capital Stock in
connection with the issuance or exchange of any series of the Company's Capital
Stock (or securities convertible into or exchangeable for shares of the
Company's Capital Stock); or (v) redemptions, exchanges or repurchases of any
rights outstanding under a shareholder rights plan or the declaration or payment
thereunder of a dividend or distribution of or with respect to rights in the
future.

         The Purchase Contracts and all obligations and rights of the Company
and the Holders thereunder, including, without limitation, the rights of Holders
to receive accumulated Contract Adjustment Payments, if any, or any Deferred
Contract Adjustment Payments and obligations of the Holders to purchase Common
Stock, will immediately and automatically terminate, without the necessity of
any notice or action by any Holder, the Agent or the Company, if, on or prior to
the Stock Purchase Date, a Termination Event shall have occurred. Upon and after
the occurrence of a Termination Event, the Collateral Agent shall release the
Pledged Treasury Securities from the Pledge in accordance with the provisions of
the Pledge Agreement. Upon the occurrence of a Termination Event, the Company
shall promptly but in no event later than two Business Days thereafter give
written notice to the Agent, the Collateral Agent and to the Holders, at their
addresses as they appear in the Stripped Units Register.

         Upon registration of transfer of this Stripped Units Certificate, the
transferee shall be bound (without the necessity of any other action on the part
of such transferee, except as may be required by the Agent pursuant to the
Purchase Contract Agreement), under the terms of the Purchase Contract
Agreement, the Purchase Contracts evidenced hereby and the Pledge Agreement and
the transferor shall be released from the obligations under the Purchase
Contract Agreement, the Purchase Contracts evidenced by this Stripped Units
Certificate and the Pledge Agreement. The Company covenants and agrees, and the
Holder, by its acceptance hereof, likewise covenants and agrees, to be bound by
the provisions of this paragraph.

                                       B-8
<PAGE>

         The Holder of this Stripped Units Certificate, by its acceptance
hereof, irrevocably authorizes the Agent to enter into and perform the related
Purchase Contracts forming part of the Stripped Units evidenced hereby on its
behalf as its attorney-in-fact (including the execution of Certificates on
behalf of such Holder), agrees to be bound by the terms and provisions thereof,
covenants and agrees to perform its obligations under such Purchase Contracts,
consents to the provisions of the Purchase Contract Agreement, irrevocably
authorizes the Agent to enter into and perform the Pledge Agreement on such
Holder's behalf as attorney-in-fact, and consents to and agrees to be bound by
the Pledge of the Treasury Securities underlying this Stripped Units Certificate
pursuant to the Pledge Agreement. The Holder further covenants and agrees, that,
to the extent and in the manner provided in the Purchase Contract Agreement and
the Pledge Agreement, but subject to the terms thereof, payments in respect of
the Pledged Treasury Securities, to be paid upon settlement of such Holder's
obligations to purchase Common Stock under the Purchase Contract, shall be paid
on the Stock Purchase Date by the Collateral Agent to the Company in
satisfaction of such Holder's obligations under such Purchase Contract and such
Holder shall acquire no right, title or interest in such payments. Each Holder
of a Stripped Unit, by acceptance thereof, will be deemed expressly to have
withheld any consent to the assumption (i.e., affirmance) under Section 365 of
the Bankruptcy Code or otherwise, of the Purchase Contract by the Company, its
trustee in bankruptcy, any receiver, liquidator or person or entity performing
similar functions in the event that the Company becomes a debtor under the
Bankruptcy Code or subject to other similar state or federal law providing for
reorganization or liquidation.

         Each Holder of any Unit, and each Beneficial Owner thereof, by its
acceptance thereof or of its interest therein, further covenants and agrees to
treat (i) itself as the owner of the related Notes, Treasury Consideration or
Treasury Securities, as the case may be, and (ii) the Notes as indebtedness of
the Company, in each case, for United States federal, state and local income and
franchise tax purposes.

         Subject to certain exceptions, the provisions of the Purchase Contract
Agreement may be amended with the consent of the Holders of a majority of the
Purchase Contracts.

         The Purchase Contracts shall for all purposes be governed by and deemed
to be a contract under, and construed in accordance with, the laws of the State
of New York, without regard to conflicts of laws principles thereof.

         The Company, the Agent and its Affiliates and any agent of the Company
or the Agent may treat the Person in whose name this Stripped Units Certificate
is registered as the owner of the Stripped Units evidenced hereby for the
purpose of receiving Contract Adjustment Payments, if any, and any Deferred
Contract Adjustment Payments performance of the Purchase Contracts and for all
other purposes whatsoever, whether or not any payments in respect thereof shall
be overdue and notwithstanding any notice to the contrary, and neither the
Company, the Agent, such Affiliates nor any agent of the Company, the Agent or
such Affiliates shall be affected by notice to the contrary.

         Prior to the purchase of shares of Common Stock under each Purchase
Contract, such Purchase Contracts shall not entitle the Holder to any of the
rights of a holder of shares of Common Stock.

                                       B-9
<PAGE>

         A copy of the Purchase Contract Agreement is available for inspection
at the offices of the Agent.

                                      B-10
<PAGE>

                                  ABBREVIATIONS

         The following abbreviations, when used in the inscription on the face
of this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM --             as tenants in common

UNIF GIFT MIN ACT --   __________________________Custodian_______________(Minor)

                       under Uniform Gifts to Minors Act_________________(State)

TEN ENT --             as tenants by the entireties

JT TEN --              as joint tenants with right of survivorship and not as
                       tenants in common

Additional abbreviations may also be used though not in the above list.

                                   ASSIGNMENT

       FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
                                transfer(s) unto
________________________________________________________________________________

________________________________________________________________________________
      (Please insert Social Security or Taxpayer I.D. or other Identifying
                               Number of Assignee)

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
(Please Print or Type Name and Address Including Postal Zip Code of Assignee)

the within Normal Units Certificates and all rights thereunder, hereby
irrevocably constituting and appointing

________________________________________________________________________________
attorney to transfer said Normal Units Certificates on the books of Pinnacle
West Capital Corporation with full power of substitution in the premises.

Dated: _________________            ____________________________________________

                                                     Signature

                                    NOTICE: The signature to this assignment
                                    must correspond with the name as it appears
                                    upon the face of the within Normal Units
                                    Certificates in every particular, without
                                    alteration or enlargement or any change
                                    whatsoever.

Signature Guarantee:
________________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

                                      B-11
<PAGE>

                             SETTLEMENT INSTRUCTIONS

         The undersigned Holder directs that a certificate for shares of Common
Stock deliverable upon settlement on or after the Stock Purchase Date of the
Purchase Contracts underlying the number of Stripped Units evidenced by this
Stripped Units Certificate (after taking into account all Units then held by
such Holder) be registered in the name of, and delivered, together with a check
in payment for any fractional share, to the undersigned at the address indicated
below unless a different name and address have been indicated below. If shares
are to be registered in the name of a Person other than the undersigned, the
undersigned will pay any transfer tax payable incident thereto.

Dated:_____________________                _____________________________________
                                                        Signature

Signature Guarantee:_______________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

If shares are to be registered in the                  REGISTERED HOLDER
name of and delivered to a Person
please (i) other than the Holder,
print such Person's name and address
and (ii) provide a guarantee of
your signature:

               PLEASE PRINT NAME AND ADDRESS OF REGISTERED HOLDER:

___________________________________        _____________________________________
               Name                                        Name

___________________________________        _____________________________________

___________________________________        _____________________________________

___________________________________        _____________________________________
              Address                                    Address

________________________________________________________________________________
         Social Security or other Taxpayer Identification Number, if any

                                      B-12
<PAGE>

                            ELECTION TO SETTLE EARLY

         The undersigned Holder of this Stripped Units Certificate hereby
irrevocably exercises the option to effect Early Settlement in accordance with
the terms of the Purchase Contract Agreement with respect to the Purchase
Contracts underlying the number of Stripped Units evidenced by this Stripped
Units Certificate specified below. The option to effect Early Settlement may be
exercised only with respect to Purchase Contracts underlying Stripped Units with
an aggregate Stated Amount equal to $1,000 or an integral multiple thereof. The
undersigned Holder directs that a certificate for shares of Common Stock
deliverable upon such Early Settlement (after taking into account all Units then
held by such Holder) be registered in the name of, and delivered, together with
a check in payment for any fractional share and any Stripped Units Certificate
representing any Stripped Units evidenced hereby as to which Early Settlement of
the related Purchase Contracts is not effected, to the undersigned at the
address indicated below unless a different name and address have been indicated
below. Pledged Treasury Securities deliverable upon such Early Settlement will
be transferred in accordance with the transfer instructions set forth below. If
shares are to be registered in the name of a Person other than the undersigned,
the undersigned will pay any transfer tax payable incident thereto.

Dated:_____________________________        _____________________________________
                                                        Signature

Signature Guarantee:_______________

Number of Units evidenced hereby as to which Early Settlement of the related
Purchase Contracts is being elected:

If shares of Common Stock or Stripped Units            REGISTERED HOLDER
Certificates are to be registered in the
name of and delivered to and Pledged Notes,
Pledged Treasury Consideration or Pledged
Applicable Ownership Interest in the
Treasury Portfolio, as the case may be, are
to be transferred to a Person other than the
Holder, please print such Person's name and
address:

               PLEASE PRINT NAME AND ADDRESS OF REGISTERED HOLDER:

___________________________________        _____________________________________
               Name                                        Name

___________________________________        _____________________________________

___________________________________        _____________________________________

___________________________________        _____________________________________
              Address                                    Address

___________________________________        _____________________________________

________________________________________________________________________________
         Social Security or other Taxpayer Identification Number, if any

Transfer instructions for Pledged Notes, Pledged Treasury Consideration or the
Pledged Applicable Ownership Interest in the Treasury Portfolio, as the case may
be, transferable upon Early Settlement or a Termination Event:

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

                                      B-13
<PAGE>

                                      B-14
<PAGE>

                    [TO BE ATTACHED TO GLOBAL CERTIFICATES]

            SCHEDULE OF INCREASES OR DECREASES IN GLOBAL CERTIFICATE

The following increases or decreases in this Global Certificate have been made:

<TABLE>
<CAPTION>
                                                                         STATED AMOUNT OF THE
                           AMOUNT OF DECREASE                             GLOBAL CERTIFICATE
                           IN STATED AMOUNT OF   AMOUNT OF INCREASE IN         FOLLOWING            SIGNATURE OF
                               THE GLOBAL         STATED AMOUNT OF THE       SUCH DECREASE      AUTHORIZED OFFICER OF
          DATE                 CERTIFICATE         GLOBAL CERTIFICATE         OR INCREASE               AGENT
------------------------   -------------------   ---------------------   --------------------   ---------------------
<S>                        <C>                   <C>                     <C>                    <C>

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------

------------------------   -------------------   ---------------------   --------------------   ---------------------
</TABLE>

                                      B-15
<PAGE>

                                                                       EXHIBIT C

          INSTRUCTION FROM PURCHASE CONTRACT AGENT TO COLLATERAL AGENT

________________,
  as Collateral Agent
c/o _______________________
___________________________
___________________________
Attention:____________________
Telecopy:_____________________

         Re:      Equity Security Units of Pinnacle West Capital Corporation
                  (the "Company")

         We hereby notify you in accordance with Section 4.1 of the Pledge
Agreement, dated as of _______________, among the Company, you, as Collateral
Agent, Custodial Agent and Securities Intermediary, and us, as Purchase Contract
Agent and as attorney-in-fact for the holders of [Normal Units] [Stripped Units]
from time to time, that the holder of securities listed below (the Holder) has
elected to substitute [$_______ aggregate principal amount of Treasury
Securities (CUSIP No. __________)] [$_______ principal amount of Notes or the
appropriate Treasury Consideration or Applicable Ownership Interest in the
Treasury Portfolio, as the case may be,] in exchange for the related [Pledged
Notes, Pledged Treasury Consideration or Pledged Applicable Ownership Interest
in the Treasury Portfolio, as the case may be [Pledged Treasury Securities
(CUSIP No. __________)] held by you in accordance with the Pledge Agreement and
has delivered to us a notice stating that the Holder has transferred [Treasury
Securities] [Notes or the appropriate Treasury Consideration or Applicable
Ownership Interest in the Treasury Portfolio, as the case may be,] to you, as
Collateral Agent. We hereby instruct you, upon receipt of such [Treasury
Securities] [Notes, Treasury Consideration or Applicable Ownership Interest in
the Treasury Portfolio, as the case may be], and upon the payment by such Holder
of any applicable fees, to release the [Pledged Notes, Pledged Treasury
Consideration or Pledged Applicable Ownership Interest in the Treasury
Portfolio, as the case may be,] [Treasury Securities] related to such [Normal
Units] [Stripped Units] to us in accordance with the Holder's instructions.

Date:______________________                   __________________,
                                                 as Collateral Agent

                                              By:_______________________________
                                                 Name:
                                                 Title:

                                      C-1
<PAGE>
\
Please print name and address of Registered Holder electing to substitute
[Treasury Securities] [Notes or Treasury Consideration or Applicable Ownership
Interest in the Treasury Portfolio, as the case may be,] for the [Pledged Notes,
Pledged Treasury Consideration or Pledged Applicable Ownership Interest in the
Treasury Portfolio, as the case may be,] [Pledged Treasury Securities]:

_____________________________________         __________________________________
               Name                                        Address

_____________________________________         __________________________________
               Name                                        Address

_____________________________________         __________________________________

_____________________________________         __________________________________

________________________________________________________________________________
         Social Security or other Taxpayer Identification Number, if any

                                      C-2
<PAGE>

                                                                       EXHIBIT D

                     INSTRUCTION TO PURCHASE CONTRACT AGENT
__________________
__________________
__________________
Attention:_______________
Telecopy:________________

         Re:      Equity Security Units of Pinnacle West capital Corporation
                  (the "Company")

         The undersigned Holder hereby notifies you that it has delivered to
_______________, as Collateral Agent, Custodial Agent and Securities
Intermediary (the "Collateral Agent") [$_________ aggregate principal amount of
Treasury Securities] [$_________ principal amount of Notes or the appropriate
Treasury Consideration or Applicable Ownership Interest in the Treasury
Portfolio, as the case may be,] in exchange for the related [Pledged Notes,
Pledged Treasury Consideration or Pledged Applicable Ownership Interest in the
Treasury Portfolio, as the case may be,] [Pledged Treasury Securities] held by
the Collateral Agent, in accordance with Section 4.1 of the Pledge Agreement,
dated as of _______________ (the "Pledge Agreement"), among you, the Company and
the Collateral Agent. The undersigned Holder has paid the Collateral Agent all
applicable fees relating to such exchange. The undersigned Holder hereby
instructs you to instruct the Collateral Agent to release to you on behalf of
the undersigned Holder the [Pledged Notes, Pledged Treasury Consideration or
Pledged Applicable Ownership Interest in the Treasury Portfolio, as the case may
be,] [Pledged Treasury Securities] related to such [Normal Units] [Stripped
Units].

Date:______________________                   By:_______________________________
                                                 Name:
                                                 Title:
Signature Guarantee:__________________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

Please print name and address of Registered Holder:

Name_____________________________             Social Security or other Taxpayer
                                              Identification Number, if any
Address__________________________

_________________________________             __________________________________

_________________________________

                                      D-1
<PAGE>

                                                                       EXHIBIT E

                        NOTICE TO SETTLE BY SEPARATE CASH
____________________
____________________
____________________
Attention:_______________
Telecopy:________________

         Re:      Equity Security Units of Pinnacle West Capital Corporation
                  (the "Company")

                  The undersigned Holder hereby irrevocably notifies you in
accordance with Section 5.4 of the Purchase Contract Agreement, dated as of
_______________ among the Company, yourselves, as Purchase Contract Agent,
Attorney-in-Fact and Trustee for the Holders of the Purchase Contracts, that
such Holder has elected to pay to the Collateral Agent, on or prior to 11:00
a.m. New York City time, on the Business Day immediately preceding the Stock
Purchase Date, (in lawful money of the United States by certified or cashiers
check or wire transfer, in each case in immediately available funds), $_________
as the Purchase Price for the shares of Common Stock issuable to such Holder by
the Company under the related Purchase Contract on the Stock Purchase Date. The
undersigned Holder hereby instructs you to notify promptly the Collateral Agent
of the undersigned Holder's election to make such cash settlement with respect
to the Purchase Contracts related to such Holder's [Normal Units].

Date:______________________                   By:_______________________________
                                                 Name:
                                                 Title:
Signature Guarantee:__________________________

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Registrar, which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the Registrar in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.

Please print name and address of Registered Holder:

Name_____________________________             Social Security or other Taxpayer
                                              Identification Number, if any
Address__________________________

_________________________________             __________________________________

_________________________________

                                      E-1Specimen AGL Capital Corporation

 

Exhibit 4.3 

 

GUARANTEE 

 

 

This GUARANTEE of AGL Resources Inc., a Georgia corporation (the “Guarantor”), is dated as of December 20, 2004. 

 

The Guarantor, for value received, hereby unconditionally guarantees to each Holder of a 4.95% Senior Note due January 15, 2015 (the “Note”) of AGL Capital Corporation, a Nevada corporation (the “Company”), authenticated and delivered by the Trustee pursuant to the terms of an Indenture by and among the Company, the Trustee and the Guarantor dated as of February 20, 2001 (the “Indenture”), and to the Trustee on behalf of each such Holder, the due and punctual payment of the principal of (and premium, if any) and interest, on each such Note, each as provided for pursuant to the terms of such Note when and as the same shall become due and payable, in accordance with the terms of such Note and of the Indenture under which it was issued. In case of the failure of the Company to make any such payment of principal (or premium, if any) or interest, the Guarantor hereby agrees to cause any such payment to be made when and as the same shall become due and payable by acceleration, call for redemption or otherwise, as if such payment were made by the Company. 

 

The Guarantor hereby agrees that its obligations hereunder shall be unconditional, irrespective of the validity, regularity or enforceability of such Note or the Indenture, the absence of any action to enforce the same, any waiver or consent by the Holder of such Note or by the Trustee with respect to any provisions thereof or of the Indenture, the obtaining of any judgment against the Company or any action to enforce the same or any other circumstances which might otherwise constitute a legal or equitable discharge or defense of a guarantor. The Guarantor hereby waives the benefits of division and discussion, diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Company, any right to require a proceeding first against the Company, protest or notice with respect to such Note or the indebtedness evidenced thereby and all demands whatsoever, and covenants that this Guarantee will not be discharged except by complete performance of the obligations contained in the Note and in the Guarantees. The Guarantees are guarantees of payment and not of collection. If the Trustee or the Holder of any Note is required by any court or otherwise to return to the Company or the Guarantor, or any custodian, receiver, liquidator, trustee, sequestrator or other similar official acting in relation to the Company or the Guarantor, any amount paid to the Trustee or such Holder in respect of a Note, this Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect. 

 

The Guarantor shall be subrogated to all rights of the Holders of a Note in respect of any amounts paid by the Guarantor on account of such Note pursuant to the provisions of this Guarantee or the Indenture; provided, however, that the Guarantor shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation until the principal of (and premium, if any) and interest, on the Note shall have been paid in full. 

 

Capitalized terms used herein have the same meanings given in the Indenture unless otherwise indicated. This Guarantee shall be governed by and construed in accordance with the law of the State of New York. 

 

This Guarantee is executed as of the day and year first above written. 

 

 

AGL RESOURCES INC. 

 

 

/s/ Richard T. O’Brien

By: Richard T. O’Brien

                                                   Title: Executive Vice President and Chief Financial Officer

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