<PAGE>   1
                                                                   Exhibit 10.30




                                     FORM OF

                                  $500,000,000


                           THREE-YEAR CREDIT AGREEMENT


                                   dated as of


                               December [ ], 2000


                                      among


                           Aetna U.S. Healthcare Inc.,
                                   as Borrower


                             The Banks Listed Herein

                                       and

                   Morgan Guaranty Trust Company of New York,
                             as Administrative Agent

                   J.P. Morgan Securities Inc., Lead Arranger

           Deutsche Bank AG, New York Branch, Co-Administrative Agent

                        Citibank, N.A., Syndication Agent

                        Bank One, NA, Documentation Agent
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                              TABLE OF CONTENTS*/

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                                                ARTICLE I

                                               DEFINITIONS

SECTION 1.01.  Definitions............................................................................   1
SECTION 1.02.  Accounting Terms and Determinations....................................................  12
SECTION 1.03.  Classifications of Borrowings..........................................................  12


                                                ARTICLE II

                                               THE CREDITS

SECTION 2.01.  Commitments to Lend....................................................................  12
SECTION 2.02.  Notice of Committed Borrowings.........................................................  12
SECTION 2.03.  Money Market Borrowings................................................................  13
SECTION 2.04.  Notice to Banks; Funding of Loans......................................................  16
SECTION 2.05.  Evidence of Debt.......................................................................  17
SECTION 2.06.  Maturity of Loans......................................................................  17
SECTION 2.07.  Termination or Reduction of Commitments................................................  17
SECTION 2.08.  Interest Rates.........................................................................  18
SECTION 2.09.  Fees...................................................................................  20
SECTION 2.10.  Method of Electing Interest Rates......................................................  20
SECTION 2.11.  Prepayments............................................................................  21
SECTION 2.12.  General Provisions as to Payments......................................................  22
SECTION 2.13.  Funding Losses.........................................................................  22
SECTION 2.14.  Computation of Interest and Fees.......................................................  23
SECTION 2.15.  Regulation D Compensation..............................................................  23


                                               ARTICLE III

                                                CONDITIONS

SECTION 3.01.  Effectiveness..........................................................................  23
SECTION 3.02.  Borrowings.............................................................................  24


                                                ARTICLE IV

                                      REPRESENTATIONS AND WARRANTIES

SECTION 4.01.  Corporate Existence and Power..........................................................  25
SECTION 4.02.  Corporate and Governmental Authorization; No
                    Contravention.....................................................................  25
SECTION 4.03.  Binding Effect.........................................................................  25
SECTION 4.04.  Financial Information..................................................................  26
SECTION 4.05.  Litigation.............................................................................  26
SECTION 4.06.  Compliance with ERISA..................................................................  26
SECTION 4.07.  Compliance with Laws and Agreements....................................................  27
SECTION 4.08.  Investment Company Act; Public Utility Holding Company
                           Act........................................................................  27
SECTION 4.09.  Full Disclosure........................................................................  27
SECTION 4.10.  Taxes..................................................................................  27
SECTION 4.11.  Spin-Off Transactions..................................................................  27


                                                ARTICLE V

                                                COVENANTS

SECTION 5.01.  Information............................................................................  27
SECTION 5.02.  Conduct of Business and Maintenance of Existence.......................................  28
SECTION 5.03.  Minimum Adjusted Consolidated Net Worth................................................  29
SECTION 5.04.  Leverage Ratio.........................................................................  29
SECTION 5.05.  Liens..................................................................................  29
SECTION 5.06.  Consolidations, Mergers and Sales of Assets............................................  30
SECTION 5.07.  Use of Proceeds........................................................................  30
SECTION 5.08.  Compliance with Laws...................................................................  30
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      */ The Table of Contents is not a part of this Agreement.


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SECTION 5.09.  Inspection of Property, Books and Records..............................................  30
SECTION 5.10.  Payment of Obligations.................................................................  31


                                                ARTICLE VI

                                                 DEFAULTS

SECTION 6.01.  Events of Default......................................................................  31
SECTION 6.02.  Notice of Default......................................................................  33


                                               ARTICLE VII

                                                THE AGENT

SECTION 7.01.  Appointment and Authorization..........................................................  33
SECTION 7.02.  Agent and Affiliates...................................................................  33
SECTION 7.03.  Action by Agent........................................................................  34
SECTION 7.04.  Consultation with Experts..............................................................  34
SECTION 7.05.  Liability of Agent.....................................................................  34
SECTION 7.06.  Indemnification........................................................................  34
SECTION 7.07.  Credit Decision........................................................................  34
SECTION 7.08.  Successor Agent........................................................................  34
SECTION 7.09.  Agent's Fees...........................................................................  35


                                               ARTICLE VIII

                                         CHANGE IN CIRCUMSTANCES

SECTION 8.01.  Basis for Determining Interest Rate Inadequate or
                           Unfair.....................................................................  35
SECTION 8.02.  Illegality.............................................................................  35
SECTION 8.03.  Increased Cost and Reduced Return......................................................  36
SECTION 8.04.  Taxes..................................................................................  37
SECTION 8.05.  Base Rate Loans Substituted for Affected Euro-Dollar
                           Loans......................................................................  39
SECTION 8.06.  Substitution of Bank...................................................................  39
SECTION 8.07.  Election to Terminate..................................................................  40


                                                ARTICLE IX

                                              MISCELLANEOUS

SECTION 9.01.  Notices................................................................................  40
SECTION 9.02.  No Waivers.............................................................................  41
SECTION 9.03.  Expenses; Indemnification..............................................................  41
SECTION 9.04.  Amendments and Waivers.................................................................  41
SECTION 9.05.  Successors and Assigns.................................................................  41
SECTION 9.06.  New York Law...........................................................................  44
SECTION 9.07.  Counterparts; Integration..............................................................  44
SECTION 9.08.  WAIVER OF JURY TRIAL...................................................................  44


Schedule 2.01  -    Commitments to Lend

Exhibit A   -       Form of Note

Exhibit B   -       Form of Money Market Quote Request

Exhibit C   -       Form of Invitation for Money Market Quotes

Exhibit D   -       Form of Money Market Quote

Exhibit E-1 -       Opinion of William C. Baskin III, Esq.
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Exhibit E-2 -       Opinion of Davis Polk & Wardwell

Exhibit E-3 -       Opinion of Drinker Biddle & Reath LLP
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<PAGE>   5


                           THREE-YEAR CREDIT AGREEMENT


                  AGREEMENT dated as of December [  ], 2000 among AETNA
U.S. HEALTHCARE INC., the BANKS listed on the signature pages
hereof, and MORGAN GUARANTY TRUST COMPANY OF NEW YORK, as
Administrative Agent.

                  The parties hereto agree as follows:


                                    ARTICLE I

                                   DEFINITIONS

                  SECTION 1.01. Definitions. The following terms, as used
herein, have the following meanings:

                  "Absolute Rate Auction" means a solicitation of Money Market
Quotes setting forth Money Market Absolute Rates pursuant to Section 2.03.

                  "Adjusted Consolidated Net Worth" means at any date the total
shareholders' equity of the Borrower and its Consolidated Subsidiaries
determined as of such date, adjusted to exclude net unrealized capital gains and
losses.

                  "Administrative Questionnaire" means, with respect to each
Bank, the administrative questionnaire in the form submitted to such Bank by the
Agent and submitted to the Agent (with a copy to the Borrower) duly completed by
such Bank.

                  "Agent" means Morgan Guaranty Trust Company of New York in its
capacity as Administrative Agent for the Banks hereunder, and its successors in
such capacity.

                  "Applicable Lending Office" means, with respect to any Bank,
(i) in the case of its Base Rate Loans, its Domestic Lending Office, (ii) in the
case of its Euro-Dollar Loans, its Euro-Dollar Lending Office and (iii) in the
case of its Money Market Loans, its Money Market Lending Office.

                  "Bank" means each bank listed on the signature pages hereof,
and its successors and assignees.

                  "Base Rate" means, for any day, a rate per annum equal to the
higher of (i) the Prime Rate for such day and (ii) the sum of 1/2 of 1% plus the
Federal Funds Rate for such day.

                  "Base Rate Loan" means (i) a Committed Loan which bears
interest at the Base Rate pursuant to the applicable Notice of Committed
Borrowing or a Notice of Interest Rate Election or the provisions of Article
VIII or (ii) an overdue amount which was a Base Rate Loan immediately before it
became overdue.

                  "Base Rate Margin" has the meaning set forth in Section
2.08(a).

                  "Borrower" means Aetna U.S. Healthcare Inc. (to be
renamed Aetna Inc. immediately after consummation of the Spin-Off
Transactions), a Pennsylvania corporation, and its successors.
<PAGE>   6
                                                                               2


                  "Borrowing" means a borrowing hereunder consisting of Loans
made to the Borrower at the same time by the Banks pursuant to Article II. A
Borrowing is a "Base Rate Borrowing" if such Loans are Base Rate Loans, a
"Euro-Dollar Borrowing" if such Loans are Euro-Dollar Loans and a "Money Market
Borrowing" if such Loans are Money Market Loans.

                  "Business" means the U.S. domestic healthcare and large case
pensions businesses of the Parent and its subsidiaries that will be owned and
operated by the Borrower and its Consolidated Subsidiaries after giving effect
to the Spin-Off Transactions.

                  "Commitment" means, with respect to each Bank, the amount set
forth opposite the name of such Bank on Schedule 2.01 hereto, as such amount may
be terminated or reduced from time to time pursuant to Section 2.07, terminated
pursuant to Section 8.07 or changed pursuant to Section 9.05.

                  "Committed Loan" means a loan made by a Bank pursuant to
Section 2.01; provided that, if any such loan or loans (or portions thereof) are
combined or subdivided pursuant to a Notice of Interest Rate Election, the term
"Committed Loan" shall refer to the combined principal amount resulting from
such combination or to each of the separate principal amounts resulting from
such subdivision, as the case may be.

                  "Consolidated EBITDA" means, for any period, Consolidated Net
Income for such period plus, without duplication, to the extent deducted in
determining such Consolidated Net Income, the sum of (a) consolidated interest
expense for such period, (b) consolidated income tax expense for such period and
(c) all amounts attributable to depreciation, amortization and other similar
non-cash charges for such period; provided that, for purposes of determining
Consolidated EBITDA for any period, Consolidated Net Income for such period
shall be adjusted to exclude, without duplication, the effect on Consolidated
Net Income for such period of (i) any Excluded Charges deducted in determining
such Consolidated Net Income, provided that adjustments pursuant to this clause
(i) shall not exceed $200,000,000 after-tax in the aggregate (for all periods on
and after the date of consummation of the Spin-Off Transactions) and (ii) any
extraordinary gains or losses for such period.

                  "Consolidated Net Income" means, for any period, the
consolidated net income (or loss) of the Borrower and its Consolidated
Subsidiaries for such period, determined in accordance with GAAP.

                  "Consolidated Subsidiary" means, at any date, any Subsidiary
or other entity the accounts of which would be consolidated with those of the
Borrower in its consolidated financial statements if such statements were
prepared as of such date.

                  "Continuing Director" means, at any time, a director who (i)
was a director of the Borrower on the Effective Date or (ii) was nominated or
elected as a director by vote of a majority of the persons who were Continuing
Directors at the time of such nomination or election.

                  "Default" means any condition or event which constitutes an
Event of Default or which with the giving of
<PAGE>   7
                                                                               3


notice or lapse of time or both would, unless cured or waived, become an Event
of Default.

                  "Disclosure Documents" means (a) the Confidential Information
Memorandum dated October 2000, relating to the Borrower and the credit
facilities provided for herein and in the Other Credit Agreements and (b) the
proxy statement dated October 18, 2000 and attachments thereto, prepared for
delivery to the Parent's shareholders in connection with the Merger, in each
case as delivered by the Borrower to the Agent for distribution to the Banks
prior to the date of execution and delivery of this Agreement.

                  "Distribution Agreement" means the Distribution Agreement
dated as of December [ ], 2000, between the Parent and the Borrower.

                  "Domestic Business Day" means any day except a Saturday,
Sunday or other day on which commercial banks in New York City are authorized by
law to close.

                  "Domestic Lending Office" means, as to each Bank, its office
located at its address set forth in its Administrative Questionnaire (or
identified in its Administrative Questionnaire as its Domestic Lending Office)
or such other office as such Bank may hereafter designate as its Domestic
Lending Office by notice to the Borrower and the Agent.

                  "Effective Date" means the date this Agreement becomes
effective in accordance with Section 3.01.

                  "Environmental Laws" means any and all federal, state, local
and foreign statutes, laws, judicial decisions, regulations, ordinances, rules,
judgments, orders, decrees, plans, injunctions, permits, concessions, grants,
franchises, licenses, agreements and other governmental restrictions relating to
the environment, the effect of the environment on human health or to emissions,
discharges or releases of pollutants, contaminants, Hazardous Substances or
wastes into the environment including, without limitation, ambient air, surface
water, ground water, or land, or otherwise relating to the manufacture,
processing, distribution, use, treatment, storage, disposal, transport or
handling of pollutants, contaminants, Hazardous Substances or wastes or the
clean-up or other remediation thereof.

                  "ERISA" means the Employee Retirement Income Security Act of
1974, as amended.

                  "ERISA Group" means all members of a controlled group of
corporations and all trades or businesses (whether or not incorporated) under
common control which, together with the Borrower, are treated as a single
employer under Section 414 of the Internal Revenue Code.

                  "Euro-Dollar Business Day" means any Domestic Business Day on
which commercial banks are open for international business (including dealings
in dollar deposits) in London.

                  "Euro-Dollar Lending Office" means, as to each Bank, its
office, branch or affiliate located at its address set forth in its
Administrative Questionnaire (or identified in its Administrative Questionnaire
as its Euro-Dollar Lending Office)
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                                                                               4


or such other office, branch or affiliate of such Bank as it may hereafter
designate as its Euro-Dollar Lending Office by notice to the Borrower and the
Agent.

                  "Euro-Dollar Loan" means (i) a Committed Loan which bears
interest at a Euro-Dollar Rate pursuant to the applicable Notice of Committed
Borrowing or a Notice of Interest Rate Election or (ii) an overdue amount which
was a Euro-Dollar Loan immediately before it became overdue.

                  "Euro-Dollar Margin" has the meaning set forth in Section
2.08(b).

                  "Euro-Dollar Rate" means a rate of interest determined
pursuant to Section 2.08(b) on the basis of the London Interbank Offered Rate.

                  "Euro-Dollar Reserve Percentage" means, for any day, that
percentage (expressed as a decimal) which is in effect on such day, as
prescribed by the Board of Governors of the Federal Reserve System (or any
successor), for determining the maximum reserve requirement for a member bank of
the Federal Reserve System in New York City with deposits exceeding five billion
dollars in respect of "Eurocurrency liabilities" (or in respect of any other
category of liabilities which includes deposits by reference to which the
interest rate on Euro-Dollar Loans is determined or any category of extensions
of credit or other assets which includes loans by a non-United States office of
any Bank to United States residents).

                  "Event of Default" has the meaning set forth in Section 6.01.

                  "Excluded Charges" means any non-recurring after-tax
charges taken by the Borrower after the date of consummation of the Spin-Off
Transactions and prior to December 31, 2001, including, but not limited to,
charges incurred to restructure operations and/or exit certain activities,
including employee termination benefits and other costs.

                  "Existing Credit Agreements" means (a) the Amended and
Restated Credit Agreement dated as of March 27, 2000, among Aetna Services,
Inc., Aetna Inc., the banks party thereto and Morgan Guaranty Trust Company of
New York, as administrative agent, and (b) the Credit Agreement dated as of June
28, 1996, among Aetna Life and Casualty Company, Aetna Inc., the banks party
thereto and Morgan Guaranty Trust Company of New York, as administrative agent,
in each case as amended to the date hereof.

                  "Federal Funds Rate" means, for any day, the rate per annum
(rounded upwards, if necessary, to the nearest 1/100th of 1%) equal to the
weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers on such
day, as published by the Federal Reserve Bank of New York on the Domestic
Business Day next succeeding such day; provided that (i) if such day is not a
Domestic Business Day, the Federal Funds Rate for such day shall be such rate on
such transactions on the next preceding Domestic Business Day as so published on
the next succeeding Domestic Business Day, and (ii) if no such rate is so
published on such next succeeding Domestic Business Day, the Federal Funds Rate
for such day shall be the average rate quoted to Morgan Guaranty Trust Company
of New York on such day on such
<PAGE>   9
                                                                               5


transactions as calculated by the Agent, such calculation to be supplied to the
Borrower upon the Borrower's request.

                  "Fitch" means Fitch, Inc.

                  "Fixed Rate Borrowing" means a Euro-Dollar Borrowing
or a Money Market Borrowing.

                  "Fixed Rate Loans" means Euro-Dollar Loans or Money Market
Loans (excluding Money Market LIBOR Loans bearing interest at the Base Rate for
the reason stated in Section 8.01) or any combination of the foregoing.

                  "GAAP" means generally accepted accounting principles in the
United States of America.

                  "Group of Loans" or "Group" means at any time a group of Loans
consisting of (i) all Committed Loans which are Base Rate Loans at such time or
(ii) all Committed Loans which are Euro-Dollar Loans having the same Interest
Period at such time; provided that, if Committed Loans of any particular Bank
are converted to or made as Base Rate Loans pursuant to Article VIII, such Loans
shall be included in the same Group or Groups of Loans from time to time as they
would have been in if they had not been so converted or made.

                  "Guarantee" of or by any Person (the "guarantor") means any
obligation, contingent or otherwise, of the guarantor guaranteeing or having the
economic effect of guaranteeing any Indebtedness of any other Person (the
"primary obligor") in any manner, whether directly or indirectly, and including
any obligation of the guarantor, direct or indirect, (a) to purchase or pay (or
advance or supply funds for the purchase or payment of) such Indebtedness or to
purchase (or to advance or supply funds for the purchase of) any security for
the payment thereof, (b) to purchase or lease property, securities or services
for the purpose of assuring the owner of such Indebtedness of the payment
thereof, including pursuant to any "synthetic" lease arrangement, (c) to
maintain working capital, equity capital or any other financial statement
condition or liquidity of the primary obligor so as to enable the primary
obligor to pay such Indebtedness or (d) as an account party in respect of any
letter of credit or letter of guaranty issued to support such Indebtedness;
provided that the term Guarantee shall not include endorsements for collection
or deposit in the ordinary course of business.

                  "Hazardous Substances" means any toxic, radioactive, caustic
or otherwise hazardous substance, including petroleum, its derivatives,
by-products and other hydrocarbons, or any substances having any constituent
elements displaying any of the foregoing characteristics.

                  "Indebtedness" of any Person means, without duplication, (a)
all obligations of such Person for borrowed money, (b) all obligations of such
Person evidenced by bonds, debentures, notes or similar instruments, (c) all
obligations of such Person under conditional sale or other title retention
agreements relating to property acquired by such Person, (d) all obligations of
such Person in respect of the deferred purchase price of property or services
(excluding current accounts payable and accrued obligations incurred in the
ordinary course of business), (e) all Indebtedness of others secured by (or for
which the holder of such Indebtedness has an existing right,
<PAGE>   10
                                                                               6


contingent or otherwise, to be secured by) any Lien on property owned or
acquired by such Person, whether or not the Indebtedness secured thereby has
been assumed, (f) all Guarantees by such Person of Indebtedness of others, (g)
all obligations of such Person as an account party to reimburse amounts drawn
under any letter of credit or letter of guaranty that constituted Indebtedness
of such Person under clause (f) above prior to drawing thereunder and (h) all
obligations of such Person in respect of leases required to be accounted for as
capital leases under GAAP.

                  "Interest Period" means:

(1) with respect to each Base Rate Borrowing, the period commencing on the date
of such Borrowing and ending on the next succeeding Quarterly Date; provided
that any Interest Period which would otherwise end after the Termination Date
shall end on the Termination Date.

(2) with respect to each Euro-Dollar Loan, a period commencing on the date of
Borrowing specified in the applicable Notice of Committed Borrowing or on the
date specified in the applicable Notice of Interest Rate Election and ending
one, two, three or six months thereafter, as the Borrower may elect in the
applicable Notice or such longer period as mutually agreed to by the Borrower
and all of the Banks; provided that:

                  (a) any Interest Period which would otherwise end on a day
         which is not a Euro-Dollar Business Day shall, subject to clause (c)
         below, be extended to the next succeeding Euro-Dollar Business Day;

                  (b) any Interest Period which begins on the last Euro-Dollar
         Business Day of a calendar month (or on a day for which there is no
         numerically corresponding day in the calendar month at the end of such
         Interest Period) shall, subject to clause (c) below, end on the last
         Euro-Dollar Business Day of a calendar month; and

                  (c) any Interest Period which would otherwise end after the
         Termination Date shall end on the Termination Date.

(3) with respect to each LIBOR Loan, the period commencing on the date of
Borrowing and ending such whole number of months thereafter, as the Borrower may
elect in accordance with Section 2.03; provided that:

                  (a) any Interest Period which would otherwise end on a day
         which is not a Euro-Dollar Business Day shall, subject to clause (c)
         below, be extended to the next succeeding Euro-Dollar Business Day;

                  (b) any Interest Period which begins on the last Euro-Dollar
         Business Day of a calendar month (or on a day for which there is no
         numerically corresponding day in the calendar month at the end of such
         Interest Period) shall, subject to clause (c) below, end on the last
         Euro-Dollar Business Day of a calendar month; and

                  (c) any Interest Period which would otherwise end after the
         Termination Date shall end on the Termination Date.
<PAGE>   11
                                                                               7


(4) with respect to each Money Market Absolute Rate Loan, the period commencing
on the date of Borrowing and ending such number of days thereafter (but not less
than 7 days) as the Borrower may elect in accordance with Section 2.03; provided
that:

                  (a) any Interest Period which would otherwise end on a day
         which is not a Euro-Dollar Business Day shall, subject to clause (b)
         below, be extended to the next succeeding Euro-Dollar Business Day; and

                  (b) any Interest Period which would otherwise end after the
         Termination Date shall end on the Termination Date.

                  "Internal Revenue Code" means the Internal Revenue Code of
1986, as amended, or any successor statute.

                  "Invitation for Money Market Quotes" means an invitation from
the Agent to the Banks to submit Money Market Quotes pursuant to Section
2.03(c).

                  "Level I Period" means any period during which any long-term
Senior Unsecured Debt of the Borrower has ratings that are better than or equal
to at least two of the following three ratings: (i) A by S&P and/or (ii) A2 by
Moody's and/or (iii) A by Fitch; provided that if S&P or Moody's or Fitch
changes its rating system after the date hereof, the new rating of such rating
agency that most closely corresponds to the level specified above for such
rating agency shall be substituted for such level.

                  "Level II Period" means any period (other than a Level I
Period) during which any long-term Senior Unsecured Debt of the Borrower has
ratings that are better than or equal to at least two of the following three
ratings: (i) A- by S&P and/or (ii) A3 by Moody's and/or (iii) A- by Fitch;
provided that if S&P or Moody's or Fitch changes its rating system after the
date hereof, the new rating of such rating agency that most closely corresponds
to the level specified above for such rating agency shall be substituted for
such level.

                  "Level III Period" means any period (other than a Level I
Period or a Level II Period) during which any long-term Senior Unsecured Debt of
the Borrower has ratings which are better than or equal to at least two of the
following three ratings: (i) BBB+ by S&P and/or (ii) Baa1 by Moody's and/or
(iii) BBB+ by Fitch; provided that if S&P or Moody's or Fitch changes its rating
system after the date hereof, the new rating of such agency that most closely
corresponds to the level specified above for such rating agency shall be
substituted for such level.

                  "Level IV Period" means any period (other than a Level I
Period, Level II Period or Level III Period) during which any long-term Senior
Unsecured Debt of the Borrower has ratings which are better than or equal to at
least two of the following three ratings: (i) BBB by S&P and/or (ii) Baa2 by
Moody's and/or (iii) BBB by Fitch; provided that if S&P or Moody's or Fitch
changes its rating system after the date hereof, the new rating of such agency
that most closely corresponds to the level specified above for such rating
agency shall be substituted for such level.

                  "Level V Period" means any period (other than a Level I
Period, Level II Period, Level III Period or Level IV Period)
<PAGE>   12
                                                                               8


during which any long-term Senior Unsecured Debt of the Borrower has ratings
which are better than or equal to at least two of the following three ratings:
(i) BBB- by S&P and/or (ii) Baa3 by Moody's and/or (iii) BBB- by Fitch; provided
that if S&P or Moody's or Fitch changes its rating system after the date hereof,
the new rating of such agency that most closely corresponds to the level
specified above for such rating agency shall be substituted for such level.

                  "Level VI Period" means any period (other than a Level I
Period, Level II Period, Level III Period, Level IV Period or Level V Period)
during which any long-term Senior Unsecured Debt of the Borrower has ratings
which are better than or equal to at least two of the following three ratings:
(i) BB+ by S&P and/or (ii) Ba1 by Moody's and/or (iii) BB+ by Fitch; provided
that if S&P or Moody's or Fitch changes its rating system after the date hereof,
the new rating of such agency that most closely corresponds to the level
specified above for such rating agency shall be substituted for such level.

                  "Level VII Period" means any period other than a Level I
Period, Level II Period, Level III Period, Level IV Period, Level V Period or
Level VI Period.

                  "Leverage Ratio" means, as of the end of any fiscal quarter of
the Borrower, the ratio of (a) Total Debt as of such date to (b) Consolidated
EBITDA for the period of four consecutive fiscal quarters of the Borrower then
ended; provided that (i) for purposes of determining the Leverage Ratio as of
March 31, 2001, the amount determined for purposes of clause (b) above shall be
Consolidated EBITDA for the fiscal quarter then ended multiplied by four, (ii)
for purposes of determining the Leverage Ratio as of June 30, 2001, the amount
determined for purposes of clause (b) above shall be Consolidated EBITDA for the
two consecutive fiscal quarters then ended multiplied by two and (iii) for
purposes of determining the Leverage Ratio as of September 30, 2001, the amount
determined for purposes of clause (b) above shall be Consolidated EBITDA for the
three consecutive fiscal quarters then ended multiplied by 4/3.

                  "LIBOR Auction" means a solicitation of Money Market Quotes
setting forth Money Market Margins based on the London Interbank Offered Rate
pursuant to Section 2.03.

                  "Lien" means, with respect to any asset, any mortgage, deed of
trust, lien, pledge, hypothecation, encumbrance, charge or security interest in,
on or of such asset.

                  "Loan" means a Base Rate Loan, a Euro-Dollar Loan or a Money
Market Loan and "Loans" means any combination of the foregoing.

                  "London Interbank Offered Rate" has the meaning set forth in
Section 2.08(b).

                  "Material Subsidiary" means a Consolidated Subsidiary of the
Borrower that, as of the time of determination of whether such Consolidated
Subsidiary is a "Material Subsidiary", accounted on a consolidated basis for 10%
or more of the total assets of the Borrower and its Consolidated Subsidiaries as
of the most recent date for which (i) a pro forma consolidated balance sheet of
the Borrower has been delivered to the Agent, until the first audited
consolidated financial statements of the
<PAGE>   13
                                                                               9


Borrower are delivered to the Agent pursuant to Section 5.01(a) or (b) and,
thereafter, (ii) a consolidated balance sheet of the Borrower has been delivered
to the Agent pursuant to Section 5.01(a) or (b); provided that, for purposes of
Article VI, if any event or combination of events described in clauses (g) and
(h) of Section 6.01 occur with respect to any one or more Consolidated
Subsidiaries that are not Material Subsidiaries but in the aggregate would
constitute a Material Subsidiary if such Consolidated Subsidiaries constituted a
single Consolidated Subsidiary, then such Consolidated Subsidiaries shall be
deemed collectively to constitute a Material Subsidiary for purposes of such
clauses.

                  "Merger" means the disposition of the Parent's financial
services and international businesses to ING Groep N.V. pursuant to a merger of
the Parent with a subsidiary of ING Groep N.V.

                  "Minimum Adjusted Consolidated Net Worth" means, as of the end
of any fiscal quarter of the Borrower, the sum of (a) $7,500,000,000 plus (b) in
the case of any determination as of the end of any fiscal quarter ending on or
after March 31, 2000, the amount equal to 50% of Consolidated Net Income in
respect of each fiscal quarter of the Borrower as to which Consolidated Net
Income is a positive amount and that ends on or after March 31, 2000, and on or
prior to such date of determination; provided that the amount of "Minimum
Adjusted Consolidated Net Worth" as of any date shall be reduced on a dollar for
dollar basis (but not by more than $200,000,000) to the extent that Adjusted
Consolidated Net Worth has been reduced on or prior to such date as a result of
any Excluded Charges.

                  "Money Market Absolute Rate" has the meaning set forth in
Section 2.03(d).

                  "Money Market Absolute Rate Loan" means a loan made or to be
made by a Bank pursuant to an Absolute Rate Auction.

                  "Money Market Lending Office" means, as to each Bank, its
Domestic Lending Office or such other office or branch of such Bank as it may
hereafter designate as its Money Market Lending Office by notice to the Borrower
and the Agent; provided that any Bank may from time to time by notice to the
Borrower and the Agent designate separate Money Market Lending Offices for its
Money Market LIBOR Loans, on the one hand, and its Money Market Absolute Rate
Loans, on the other hand, in which case all references herein to the Money
Market Lending Office of such Bank shall be deemed to refer to either or both of
such offices, as the context may require.

                  "Money Market LIBOR Loan" means a loan made or to be made by a
Bank pursuant to a LIBOR Auction (including such a loan bearing interest at the
Base Rate for the reason stated in Section 8.01).

                  "Money Market Loan" means a Money Market LIBOR Loan or a Money
Market Absolute Rate Loan.

                  "Money Market Margin" has the meaning set forth in Section
2.03(d).

                  "Money Market Quote" means an offer by a Bank to make a Money
Market Loan in accordance with Section 2.03.
<PAGE>   14
                                                                              10


                  "Money Market Quote Request" means a request by the Borrower
to the Banks to make Money Market Loans in accordance with Section 2.03(b).

                  "Moody's" means Moody's Investors Service, Inc.

                  "Notes" means promissory notes of the Borrower, substantially
in the form of Exhibit A hereto, evidencing the obligation of the Borrower to
repay the Loans, and "Note" means any one of such promissory notes issued
hereunder.

                  "Notice of Borrowing" means a Notice of Committed Borrowing
(as defined in Section 2.02) or a Notice of Money Market Borrowing (as defined
in Section 2.03(f)).

                  "Notice of Interest Rate Election" has the meaning set forth
in Section 2.10.

                  "Other Credit Agreements" means the $1,500,000,000 Bridge
Credit Agreement and the $500,000,000 364-Day Credit Agreement, each dated as of
the date hereof, among the Borrower, the banks listed therein and Morgan
Guaranty Trust Company of New York, as administrative agent, as amended and
otherwise in effect from time to time.

                  "Other Taxes" has the meaning set forth in Section 8.04(a).

                  "Parent" means Aetna Inc., a Connecticut corporation,
and its successors.

                  "Participant" has the meaning set forth in Section 9.05(e).

                  "PBGC" means the Pension Benefit Guaranty Corporation or any
entity succeeding to any or all of its functions under ERISA.

                  "Person" means an individual, a corporation, a limited
liability company, a partnership, an association, a trust or any other entity or
organization, including a government or political subdivision or an agency or
instrumentality thereof.

                  "Plan" means at any time an employee pension benefit plan
which is covered by Title IV of ERISA or subject to the minimum funding
standards under Section 412 of the Internal Revenue Code and is either (i)
maintained by a member of the ERISA Group for employees of a member of the ERISA
Group or (ii) maintained pursuant to a collective bargaining agreement or any
other arrangement under which more than one employer makes contributions and to
which a member of the ERISA Group is then making or accruing an obligation to
make contributions or has within the preceding five plan years made
contributions.

                  "Prime Rate" means the rate of interest publicly announced by
Morgan Guaranty Trust Company of New York in New York City from time to time as
its Prime Rate.

                  "Quarterly Date" means the last Domestic Business Day of each
March, June, September and December.
<PAGE>   15
                                                                              11


                  "Regulation U" means Regulation U of the Board of Governors of
the Federal Reserve System, as in effect from time to time.

                  "Reportable Event" means any reportable event as defined in
Section 4043(c) of ERISA or the regulations issued thereunder (other than a
Reportable Event as to which the 30-day notice requirement has been waived by
applicable regulation) with respect to a Plan (other than a Plan maintained by a
member of an applicable ERISA Group that is considered a member of such ERISA
Group only pursuant to subsection (m) or (o) of Section 414 of the Internal
Revenue Code).

                  "Required Banks" means at any time Banks having at least 60%
of the aggregate amount of the Commitments or, if the Commitments shall have
been terminated, holding at least 60% of the aggregate unpaid principal amount
of the Loans.

                  "Required Capital" has the meaning set forth in Section
8.03(b).

                  "Responsible Financial Officer" means chief financial officer,
treasurer, chief accounting officer or senior corporate finance officer.

                  "Revolving Credit Period" means the period from the Effective
Date to and including the Termination Date.

                  "S&P" means Standard & Poor's Ratings Services, a division of
The McGraw-Hill Companies, Inc.

                  "Senior Unsecured Debt" means indebtedness for borrowed money
that is not subordinated to any other indebtedness for borrowed money and is not
secured or supported by a guarantee, letter of credit or other form of credit
enhancement.

                  "Spin-Off Transactions" means (a) the distribution by the
Parent to its shareholders of the shares of common stock of the Borrower
contemplated by the Distribution Agreement and (b) the Restructuring (as defined
in the Distribution Agreement).

                  "Subsidiary" means any corporation or other entity of which
securities or other ownership interests having ordinary voting power to elect a
majority of the board of directors or other persons performing similar functions
are at the time directly or indirectly owned by the Borrower.

                  "Taxes" has the meaning set forth in Section 8.04(a).

                  "Termination Date" means December [ ], 2003, or, if such day
is not a Euro-Dollar Business Day, the next preceding Euro-Dollar Business Day.

                  "Total Debt" means, as of any date, the aggregate principal
amount of Indebtedness of the Borrower and its Consolidated Subsidiaries as of
such date (whether or not such Indebtedness would be reflected on a consolidated
balance sheet prepared as of such date in accordance with GAAP), determined on a
consolidated basis.

                  "Trigger Event" has the meaning set forth in Section 8.03(c).
<PAGE>   16
                                                                              12


                  SECTION 1.02. Accounting Terms and Determinations. Unless
otherwise specified herein, all accounting terms used herein shall be
interpreted, all accounting determinations hereunder shall be made, and all
financial statements required to be delivered hereunder shall be prepared in
accordance with GAAP as in effect from time to time, applied on a basis
consistent (except for changes concurred in by the Borrower's independent public
accountants) with the most recent audited consolidated financial statements of
(a) the Parent and its consolidated subsidiaries, until the first audited
consolidated financial statements of the Borrower are delivered hereunder and
(b) thereafter, the Borrower and its Consolidated Subsidiaries delivered to the
Banks.

                  SECTION 1.03. Classifications of Borrowings. Borrowings are
classified for purposes of this Agreement either by reference to the pricing of
Loans comprising such Borrowing (e.g., a "Euro-Dollar Borrowing" is a Borrowing
comprised of Euro-Dollar Loans) or by reference to the provisions of Article II
under which participation therein is determined (i.e., a "Committed Borrowing"
is a Borrowing under Section 2.01 in which all Banks participate in proportion
to their Commitments, while a "Money Market Borrowing" is a Borrowing under
Section 2.03 in which the Bank participants are determined on the basis of their
bids).


                                   ARTICLE II

                                   THE CREDITS

          SECTION 2.01. Commitments to Lend. On the terms and conditions set
forth in this Agreement, each Bank severally agrees to lend to the Borrower,
from time to time during the Revolving Credit Period, amounts not to exceed in
the aggregate at any one time outstanding the amount of such Bank's Commitment.
Each Borrowing under this Section 2.01 shall be in an aggregate principal amount
of $20,000,000 or any larger multiple of $1,000,000 (except that any such
Borrowing may be in the aggregate amount of the unused Commitments) and shall be
made from the several Banks ratably in proportion to their respective
Commitments. Within the foregoing limits, the Borrower may borrow under this
Section, repay, or to the extent permitted by Section 2.11, prepay Loans and
reborrow at any time during the Revolving Credit Period under this Section.
Failure by any Bank to make Loans as required under the terms of this Agreement
will not relieve any other Bank of its obligations hereunder. Notwithstanding
the foregoing, any Money Market Loans made by a Bank shall be deemed usage of
the total Commitments for the purpose of availability, but shall not reduce such
Bank's obligation to lend its pro rata share of its Commitment.

                  SECTION 2.02. Notice of Committed Borrowings. The Borrower
shall give the Agent notice (a "Notice of Committed Borrowing") not later than
10:30 A.M. (New York City time) on (x) the date of each Base Rate Borrowing and
(y) the third Euro-Dollar Business Day before each Euro-Dollar Borrowing,
specifying:

                  (a) the date of such Borrowing, which shall be a Domestic
         Business Day in the case of a Base Rate Borrowing and a Euro-Dollar
         Business Day in the case of a Euro-Dollar Borrowing,
<PAGE>   17
                                                                              13


                  (b) the aggregate amount of such Borrowing,

                  (c) whether the Loans comprising such Borrowing
         are to be Base Rate Loans or Euro-Dollar Loans, and

                  (d) in the case of a Euro-Dollar Borrowing, the duration of
         the initial Interest Period applicable thereto, subject to the
         provisions of the definition of Interest Period.

                  SECTION 2.03.  Money Market Borrowings.

                  (a) The Money Market Option. In addition to Committed Loans
pursuant to Section 2.01, the Borrower may, as set forth in this Section,
request the Banks from time to time during the Revolving Credit Period to make
offers to make Money Market Loans to the Borrower. The Banks may, but shall have
no obligation to, make such offers and the Borrower may, but shall have no
obligation to, accept any such offers in the manner set forth in this Section.

                  (b) Money Market Quote Request. When the Borrower wishes to
request offers to make Money Market Loans under this Section, it shall transmit
to the Agent by telex or facsimile transmission a Money Market Quote Request
substantially in the form of Exhibit B hereto so as to be received no later than
10:00 A.M. (New York City time) on (x) the fourth Euro-Dollar Business Day prior
to the date of Borrowing proposed therein, in the case of a LIBOR Auction or (y)
the Domestic Business Day next preceding the date of Borrowing proposed therein,
in the case of an Absolute Rate Auction (or, in either case, such other time or
date as the Borrower and the Agent shall have mutually agreed upon and shall
have notified to the Banks not later than the date of the Money Market Quote
Request for the first LIBOR Auction or Absolute Rate Auction for which such
change is to be effective) specifying:

                  (i) the proposed date of Borrowing, which shall be a
         Euro-Dollar Business Day in the case of a LIBOR Auction or a Domestic
         Business Day in the case of an Absolute Rate Auction,

                  (ii)  the aggregate amount of such Borrowing, which
         shall be $20,000,000 or a larger multiple of $1,000,000,

                  (iii)  the duration of the Interest Period applicable
         thereto, subject to the provisions of the definition of
         Interest Period, and

                  (iv) whether the Money Market Quotes requested are to set
         forth a Money Market Margin or a Money Market Absolute Rate.

The Borrower may request offers to make Money Market Loans for more than one
Interest Period in a single Money Market Quote Request. No Money Market Quote
Request shall be given within five Euro-Dollar Business Days (or following
notice to each of the Banks, such other number of days as the Borrower and the
Agent may agree upon) of any other Money Market Quote Request.

                  (c) Invitation for Money Market Quotes. Promptly upon receipt
of a Money Market Quote Request, the Agent shall
<PAGE>   18
                                                                              14


send to the Banks by telex or facsimile transmission an Invitation for Money
Market Quotes substantially in the form of Exhibit C hereto, which shall
constitute an invitation by the Borrower to each Bank to submit Money Market
Quotes offering to make the Money Market Loans to which such Money Market Quote
Request relates in accordance with this Section.

                  (d) Submission and Contents of Money Market Quotes. (i) Each
Bank may submit a Money Market Quote containing an offer or offers to make Money
Market Loans in response to any Invitation for Money Market Quotes. Each Money
Market Quote must comply with the requirements of this subsection (d) and must
be submitted to the Agent by telex or facsimile transmission at its offices
specified in or pursuant to Section 9.01 not later than (x) 9:30 A.M. (New York
City time) on the third Euro-Dollar Business Day prior to the proposed date of
Borrowing, in the case of a LIBOR Auction or (y) 9:30 A.M. (New York City time)
on the proposed date of Borrowing, in the case of an Absolute Rate Auction (or,
in either case, such other time or date as the Borrower and the Agent shall have
mutually agreed and shall have notified to the Banks not later than the date of
the Money Market Quote Request for the first LIBOR Auction or Absolute Rate
Auction for which such change is to be effective); provided that Money Market
Quotes submitted by the Agent (or any affiliate of the Agent) in the capacity of
a Bank may be submitted, and may only be submitted, if the Agent or such
affiliate notifies the Borrower of the terms of the offer or offers contained
therein not later than (x) 9:15 A.M. (New York City time) on the third
Euro-Dollar Business Day prior to the proposed date of Borrowing, in the case of
a LIBOR Auction or (y) 9:15 A.M. (New York City time) on the proposed date of
Borrowing, in the case of an Absolute Rate Auction. Subject to Articles III and
VI, any Money Market Quote so made shall be irrevocable except with the written
consent of the Agent given on the instructions of the Borrower.

                  (ii) Each Money Market Quote shall be in substantially the
form of Exhibit D hereto and shall in any case specify:

                  (A) the proposed date of Borrowing,

                  (B) the principal amount of the Money Market Loan for which
         each such offer is being made, which principal amount (x) may be
         greater than or less than the Commitment of the quoting Bank, (y) must
         be $20,000,000 or a larger multiple of $1,000,000 and (z) may not
         exceed the principal amount of Money Market Loans for which offers were
         requested,

                  (C) in the case of a LIBOR Auction, the margin above or below
         the applicable London Interbank Offered Rate (the "Money Market
         Margin") offered for each such Money Market Loan, expressed as a
         percentage (rounded to the nearest 1/10,000th of 1%) to be added to or
         subtracted from such base rate,

                  (D) in the case of an Absolute Rate Auction, the rate of
         interest per annum (rounded to the nearest 1/10,000th of 1%) (the
         "Money Market Absolute Rate") offered for each such Money Market Loan,
         and

                  (E) the identity of the quoting Bank.
<PAGE>   19
                                                                              15


A Money Market Quote may set forth up to five separate offers by the quoting
Bank with respect to each Interest Period specified in the related Invitation
for Money Market Quotes.

                  (iii)  Any Money Market Quote shall be disregarded if
it:

                  (A) is not substantially in conformity with Exhibit D hereto
         or does not specify all of the information required by subsection
         (d)(ii);

                  (B) contains qualifying, conditional or similar
         language;

                  (C) proposes terms other than or in addition to those set
         forth in the applicable Invitation for Money Market Quotes; or

                  (D) arrives after the time set forth in subsection (d)(i).

                  (e) Notice to Borrower. The Agent shall promptly notify the
Borrower of the terms (x) of any Money Market Quote submitted by a Bank that is
in accordance with subsection (d) and (y) of any Money Market Quote that amends,
modifies or is otherwise inconsistent with a previous Money Market Quote
submitted by such Bank with respect to the same Money Market Quote Request. Any
such subsequent Money Market Quote shall be disregarded by the Agent unless such
subsequent Money Market Quote is submitted solely to correct a manifest error in
such former Money Market Quote. The Agent's notice to the Borrower shall specify
(A) the aggregate principal amount of Money Market Loans for which offers have
been received for each Interest Period specified in the related Money Market
Quote Request, (B) the respective principal amounts and Money Market Margins or
Money Market Absolute Rates, as the case may be, so offered (including the names
of the Banks) and (C) if applicable, limitations on the aggregate principal
amount of Money Market Loans for which offers in any single Money Market Quote
for any Interest Period may be accepted.

                  (f) Acceptance and Notice by Borrower. Not later than 10:30
A.M. (New York City time) on (x) the third Euro-Dollar Business Day prior to the
proposed date of Borrowing, in the case of a LIBOR Auction or (y) the proposed
date of Borrowing, in the case of an Absolute Rate Auction (or, in either case,
such other time or date as the Borrower and the Agent shall have mutually agreed
upon and shall have notified to the Banks not later than the date of the Money
Market Quote Request for the first LIBOR Auction or Absolute Rate Auction for
which such change is to be effective), the Borrower shall notify the Agent of
its acceptance or non-acceptance of the offers so notified to it pursuant to
subsection (e). In the case of acceptance, such notice (a "Notice of Money
Market Borrowing") shall specify the aggregate principal amount of offers for
each Interest Period that are accepted. The Borrower may accept any Money Market
Quote for any Interest Period in whole or in part; provided that:

                  (i) the aggregate principal amount of each Money Market
         Borrowing may not exceed the applicable amount set forth in the related
         Money Market Quote Request,
<PAGE>   20
                                                                              16


                  (ii) the principal amount of each Money Market
         Borrowing must be $20,000,000 or a larger multiple of
         $1,000,000,

                  (iii) acceptance of offers may only be made on the basis of
         ascending Money Market Margins or Money Market Absolute Rates, as the
         case may be, and

                  (iv) the Borrower may not accept any offer that is described
         in subsection (d)(iii) or that otherwise fails to comply with the
         requirements of this Agreement.

                  (g) Allocation by Agent. If offers are made by two or more
Banks with the same Money Market Margins or Money Market Absolute Rates, as the
case may be, for a greater aggregate principal amount than the amount in respect
of which such offers are accepted for the related Interest Period, the principal
amount of Money Market Loans in respect of which such offers are accepted shall
be allocated by the Agent among such Banks as nearly as possible (in multiples
of such number, not greater than $1,000,000 as the Agent may deem appropriate)
in proportion to the aggregate principal amounts of such offers. Determinations
by the Agent of the pro rata amounts of Money Market Loans shall be conclusive
in the absence of manifest error.

                  SECTION 2.04. Notice to Banks; Funding of Loans. (a) Upon
receipt of a Notice of Borrowing, the Agent shall promptly notify each Bank of
the contents thereof and of such Bank's share (if any) of such Borrowing and
such Notice of Borrowing shall not thereafter be revocable by the Borrower.

                  (b) Not later than 12:00 Noon (New York City time) on the date
of each Borrowing, each Bank participating therein shall make available its
share of such Borrowing, in Federal or other funds immediately available in New
York City, to the Agent at its address specified in or pursuant to Section 9.01.
Unless the Agent determines that any applicable condition specified in Article
III has not been satisfied, the Agent will make the funds so received from the
Banks available to the Borrower at the Agent's aforesaid address.

                  (c) Unless the Agent shall have received notice from a Bank
prior to the date of any Borrowing that such Bank will not make available to the
Agent such Bank's share of such Borrowing, the Agent may assume that such Bank
has made such share available to the Agent on the date of such Borrowing in
accordance with subsection (b) of this Section 2.04 and the Agent may, in
reliance upon such assumption, make available to the Borrower on such date a
corresponding amount. If and to the extent that such Bank shall not have so made
such share available to the Agent, such Bank and the Borrower severally agree to
repay to the Agent forthwith on demand such corresponding amount together with
interest thereon, for each day from the date such amount is made available to
the Borrower until the date such amount is repaid to the Agent, at (i) in the
case of the Borrower, a rate per annum equal to the higher of the Federal Funds
Rate and the interest rate applicable thereto pursuant to Section 2.08 and (ii)
in the case of such Bank, the Federal Funds Rate. If such Bank shall repay to
the Agent such corresponding amount, such amount so repaid shall constitute such
Bank's Loan included in such Borrowing for purposes of this Agreement.
<PAGE>   21
                                                                              17


                  SECTION 2.05. Evidence of Debt. (a) Each Bank shall maintain
in accordance with its usual practice an account or accounts evidencing the
indebtedness of the Borrower to such Bank resulting from each Loan made by such
Bank, including the amounts of principal and interest payable and paid to such
Bank from time to time hereunder.

                  (b) The Agent shall maintain accounts in which it shall record
(i) the Commitment of each Bank and the amount of each Loan made hereunder by
such Bank, (ii) the amount of any principal or interest due and payable or to
become due and payable from the Borrower to each Bank hereunder and (iii) the
amount of any sum received by the Agent hereunder for the accounts of the Banks
and each Bank's share thereof.

                  (c) The entries made in the accounts maintained pursuant to
paragraph (b) of this Section 2.05 shall be evidence of the existence and
amounts of the obligations recorded therein and shall be presumptively correct
absent demonstrable error; provided that the failure of the Agent to maintain
such accounts or any error therein shall not in any manner affect the obligation
of the Borrower to repay the Loans in accordance with the terms of this
Agreement.

                  (d) Any Bank may request in writing that Loans made by it be
evidenced by a Note. In such event, the Borrower shall prepare, execute and
deliver to such Bank a Note payable to the order of such Bank in the form of
Exhibit A. Thereafter, the Loans evidenced by such Note and interest thereon
shall at all times (including after assignment pursuant to Section 9.05) be
represented by one or more Notes in such form payable to the order of the payee
named therein.

                  (e) Each Bank agrees that it will cancel and return to the
Borrower all Notes then held by it upon the earlier of (i) the Termination Date;
provided that no Default shall have then occurred and be continuing or (ii) the
date such Bank's Commitment has been terminated and there are no Loans
outstanding to or accrued interest owing to such Bank.

                  SECTION 2.06. Maturity of Loans. (a) The Committed Loans of
each Bank shall mature, and the principal amount thereof shall be due and
payable, together with accrued interest thereon, on the Termination Date.

                  (b) Each Money Market Loan shall mature, and the principal
amount thereof shall be due and payable, together with accrued interest thereon,
on the last day of the Interest Period applicable to such Money Market Loan.

                  SECTION 2.07. Termination or Reduction of Commitments. (a) The
Commitments of each Bank shall terminate on the Termination Date.

                  (b) During the Revolving Credit Period the Borrower may, upon
at least three Domestic Business Days' notice to the Agent, terminate the
Commitments at any time, if no Loans are outstanding at such time.

                  (c) During the Revolving Credit Period the Borrower may, upon
at least three Domestic Business Days' notice to the Agent, ratably reduce the
Commitments from time to time by an aggregate amount of $10,000,000 or any
larger multiple of
<PAGE>   22
                                                                              18


$1,000,000, but only to the extent that the aggregate amount of the Commitments
exceeds the aggregate outstanding principal amount of the Loans.

                  SECTION 2.08. Interest Rates. (a) Each Base Rate Loan shall
bear interest on the outstanding principal amount thereof, for each day from the
date such Loan is made until it becomes due, at a rate per annum equal to the
Base Rate Margin plus the Base Rate for such day. Such interest shall be payable
for each Interest Period on the earlier of (i) the last day of the Interest
Period applicable thereto or (ii) the Termination Date. Any overdue principal of
and, to the extent permitted by law, overdue interest on any Base Rate Loan
shall bear interest, payable on demand, for each day until paid at a rate per
annum equal to the sum of 1% plus the Base Rate Margin plus the Base Rate for
such day.

                  The "Base Rate Margin" applicable to any Base Rate Loan
outstanding on any day means:

                  (i) if such day falls within a Level I Period, Level II
         Period, Level III Period or Level IV Period, then 0%;

                  (ii) if such day falls within a Level V Period, then
         .375%;

                  (iii) if such day falls within a Level VI Period, then
         .750%; and

                  (iv) if such day falls within a Level VII Period,
         then 1.500%.

                  (b) Each Euro-Dollar Loan shall bear interest on the
outstanding principal amount thereof, for each Interest Period applicable
thereto, at a rate per annum equal to the sum of the Euro-Dollar Margin plus the
applicable London Interbank Offered Rate. Such interest shall be payable for
each Interest Period on the earlier of (i) the last day thereof, (ii) three
months after the initial date thereof and, if such Interest Period is longer
than three months, at intervals of three months thereafter or (iii) the
Termination Date.

                  "Euro-Dollar Margin" applicable to any Euro-Dollar Loan
outstanding on any day means:

                  (i) if such day falls within a Level I Period, then
         .400%;

                  (ii) if such day falls within a Level II Period, then
         .515%;

                  (iii) if such day falls within a Level III Period, then
         .725%;

                  (iv) if such day falls within a Level IV Period, then
         .825%;

                  (v) if such day falls within a Level V Period, then
         1.125%;

                  (vi) if such day falls within a Level VI Period, then
         1.375%; and

                  (vii) if such day falls within a Level VII Period, then
         2.0%.
<PAGE>   23
                                                                              19


                  The "London Interbank Offered Rate" applicable to any Interest
Period means the rate per annum (rounded upwards, if necessary, to the nearest
1/32 of 1%) appearing on Dow Jones Markets page 3750 (or any successor page) as
the London interbank offered rate for deposits in U.S. dollars at 11:00 A.M.
(London time) two Euro-Dollar Business Days before the first day of such
Interest Period for a period equal to such Interest Period; provided that, if
for any reason such rate is not available, the term "London Interbank Offered
Rate" applicable to any Interest Period shall mean the rate per annum (rounded
upwards, if necessary, to the nearest 1/32 of 1%) appearing on Reuters Screen
LIBO Page (or any successor page) as the London interbank offered rate for
deposits in U.S. dollars at approximately 11:00 A.M. (London time) two
Euro-Dollar Business Days before the first day of such Interest Period for a
period equal to such Interest Period; provided, however, if more than one rate
is specified on Reuters Screen LIBO Page (or any successor page), the applicable
rate shall be the arithmetic mean of all such rates.

                  (c) Any overdue principal of and, to the extent permitted by
law, overdue interest on any Euro-Dollar Loan shall bear interest, payable on
demand, for each day from and including the date payment thereof was due to but
excluding the date of actual payment, at a rate per annum equal to the sum of 1%
plus the Euro-Dollar Margin plus the higher of (i) the London Interbank Offered
Rate applicable to such Loan and (ii) the average (rounded upward, if necessary,
to the next higher 1/100 of 1%) of the respective rates per annum at which one
day (or, if such amount due remains unpaid more than three Euro-Dollar Business
Days, then for such other period of time not longer than three months as the
Agent may select) deposits in dollars in an amount approximately equal to such
overdue payment due to the Agent are offered to the Agent in the London
interbank market for the applicable period determined as provided above (or, if
the circumstances described in Section 8.01 shall exist, at a rate per annum
equal to the sum of 1% plus the Base Rate for such day).

                  (d) Subject to clause (y) of Section 8.01, each Money Market
LIBOR Loan shall bear interest on the outstanding principal amount thereof, for
the Interest Period applicable thereto, at a rate per annum equal to the sum of
the London Interbank Offered Rate for such Interest Period plus (or minus) the
Money Market Margin quoted by the Bank making such Loan in accordance with
Section 2.03. Each Money Market Absolute Rate Loan shall bear interest on the
outstanding principal amount thereof, for the Interest Period applicable
thereto, at a rate per annum equal to the Money Market Absolute Rate quoted by
the Bank making such Loan in accordance with Section 2.03. Such interest shall
be payable for each Interest Period on the earlier of (i) the last day thereof,
(ii) three months after the initial date thereof and, if such Interest Period is
longer than three months, at intervals of three months thereafter or (iii) the
Termination Date. Any overdue principal of and, to the extent permitted by law,
overdue interest on any Money Market Loan shall bear interest, payable on
demand, for each day until paid at a rate per annum equal to the sum of 1% plus
the Base Rate for such day.

                  (e) The Agent shall determine (in accordance with this
Agreement) each interest rate applicable to the Loans hereunder. The Agent shall
give prompt notice to the Borrower by telecopy and the participating Banks by
telex, cable or telecopy
<PAGE>   24
                                                                              20


of each rate of interest so determined, and its determination thereof shall be
conclusive in the absence of manifest error.

                  SECTION 2.09.  Fees.

                  (a) Facility Fee. The Borrower shall pay to the Agent for the
account of the Banks, ratably in proportion to their Commitments, a facility fee
at the rate of (i) 0.100% per annum during each Level I Period, (ii) 0.110% per
annum during each Level II Period, (iii) 0.150% per annum during each Level III
Period, (iv) 0.175% per annum during each Level IV Period, (v) 0.250% per annum
during each Level V Period, (vi) 0.375% during each Level VI Period and (vii)
0.500% during each Level VII Period. Such facility fee shall accrue (i) from and
including the Effective Date to but excluding the last day of the Revolving
Credit Period, in each case, on the daily average aggregate amount of the
Commitments (whether used or unused) and (ii) if any Loans remain outstanding
after the Revolving Credit Period, from and including the last day of the
Revolving Credit Period to but excluding the date such Loans shall be repaid in
full, on the daily average aggregate outstanding principal amount of such Loans.

                  (b) Payments. Except as otherwise indicated, accrued facility
fees under this Section 2.09 shall be payable quarterly in arrears on (i) each
Quarterly Date, (ii) the Termination Date and (iii) if any Loans remain
outstanding after the Revolving Credit Period, the date such Loans shall be
repaid in full.

                  SECTION 2.10. Method of Electing Interest Rates. (a) The Loans
included in each Committed Borrowing shall bear interest initially at the type
of rate specified by the Borrower in the applicable Notice of Committed
Borrowing. Thereafter, the Borrower may from time to time elect to change or
continue the type of interest rate borne by each Group of Loans (subject in each
case to the provisions of Article VIII), as follows:

                  (i) if such Loans are Base Rate Loans, the Borrower may elect
         to convert such Loans to Euro-Dollar Loans as of any Euro-Dollar
         Business Day; and

                  (ii) if such Loans are Euro-Dollar Loans, the Borrower may (x)
         elect to convert such Euro-Dollar Loans to Base Rate Loans as of any
         Domestic Business Day, (y) elect to convert such Euro-Dollar Loans to
         Euro-Dollar Loans with an Interest Period different from the then
         current Interest Period applicable to such Loans as of any Euro-Dollar
         Business Day or (z) elect to continue such Loans as Euro-Dollar Loans
         for an additional Interest Period beginning on the last day of the then
         current Interest Period applicable to such Loans;

provided that, if the Borrower elects to convert any Euro-Dollar Loans to Base
Rate Loans or to Euro-Dollar Loans with a different Interest Period, as of any
day other than the last day of the then current Interest Period applicable to
such Loans, the Borrower shall reimburse each Bank in accordance with Section
2.13.

                  Each such election shall be made by delivering a notice (a
"Notice of Interest Rate Election") to the Agent (i) at least one Domestic
Business Day before such notice is to be effective if the relevant Loans are to
be converted into Base
<PAGE>   25

                                                                              21


Rate Loans or (ii) at least three Euro-Dollar Business Days before such
conversion or continuation is to be effective if such Loans are to be converted
into, or continued as, Euro-Dollar Loans.

                  A Notice of Interest Rate Election may, if it so specifies,
apply to only a portion of the aggregate principal amount of the relevant Group
of Loans; provided that (i) such portion is allocated ratably among the Loans
comprising such Group and (ii) the portion to which such Notice applies, and the
remaining portion to which it does not apply, are each $20,000,000 or any larger
multiple of $1,000,000.


                  (b)  Each Notice of Interest Rate Election shall
specify:

                  (i) the Group of Loans (or portion thereof) to
         which such notice applies;

                  (ii) the date on which the conversion or continuation selected
         in such notice is to be effective, which shall comply with the
         applicable clause of subsection (a) above;

                  (iii) whether such Group of Loans (or portion thereof) is to
         be converted to Base Rate Loans or Euro-Dollar Loans or continued as
         Euro-Dollar Loans for an additional Interest Period; and

                  (iv) if such Loans (or portions thereof) are to be converted
         to or continued as Euro-Dollar Loans, the duration of the Interest
         Period to be applicable thereto immediately after such conversion or
         continuation.

Each Interest Period specified in a Notice of Interest Rate Election shall
comply with the provisions of the definition of Interest Period.

                  (c) Upon receipt of a Notice of Interest Rate Election from
the Borrower pursuant to subsection (a) above, the Agent shall promptly notify
each Bank of the contents thereof and such notice shall not thereafter be
revocable by the Borrower. If the Borrower fails to deliver a timely Notice of
Interest Rate Election to the Agent for any Euro-Dollar Loans, such Loans shall
be converted into Base Rate Loans on the last day of the then current Interest
Period applicable thereto.

                  SECTION 2.11. Prepayments. (a) The Borrower may (i) upon at
least one Domestic Business Day's notice to the Agent, prepay the Base Rate
Loans (or any Money Market LIBOR Loans which bear interest at the Base Rate at
such time for the reason stated in Section 8.01), in whole or in part, on any
Domestic Business Day and (ii) upon at least two Euro-Dollar Business Days'
notice to the Agent, prepay any Euro-Dollar Loan, in whole or in part, in
amounts aggregating $20,000,000 or any larger multiple of $1,000,000, by paying
the principal amount to be prepaid together with accrued interest thereon to the
date of prepayment; provided that Money Market Loans may not be prepaid other
than as contemplated by clause (i) above. Each such optional prepayment shall be
applied to prepay ratably the relevant Loans of the several Banks. Prepayment of
a Euro-Dollar Loan on any day other than the last day of an Interest Period
applicable thereto shall be subject to Section 2.13.
<PAGE>   26
                                                                              22


                  (b) Upon receipt of a notice of prepayment pursuant to this
Section 2.11, the Agent shall promptly notify each Bank of the contents thereof
and of such Bank's ratable share (if any) of such prepayment and such notice
shall not thereafter be revocable by the Borrower.

                  SECTION 2.12. General Provisions as to Payments. (a) The
Borrower shall make each payment of principal of, and interest on, the Loans and
of fees hereunder, not later than 12:00 Noon (New York City time) on the date
when due, in Federal or other funds immediately available in New York City, to
the Agent at its address referred to in its Administrative Questionnaire. The
Agent will promptly distribute to each Bank its ratable share of each such
payment received by the Agent for the account of the Banks. Whenever any payment
of principal of, or interest on, any Base Rate Loans or fees shall be due on a
day which is not a Domestic Business Day, the date for payment thereof shall be
extended to the next succeeding Domestic Business Day. Whenever any payment of
principal of, or interest on, the Euro-Dollar Loans and Money Market LIBOR Loans
shall be due on a day which is not a Euro-Dollar Business Day, the date for
payment thereof shall be extended to the next succeeding Euro-Dollar Business
Day unless such Euro-Dollar Business Day falls in another calendar month or
falls after the Termination Date, in which case the date for payment thereof
shall be the next preceding Euro-Dollar Business Day. Whenever any payment of
principal of, or interest on, the Money Market Absolute Rate Loans shall be due
on a day which is not a Euro-Dollar Business Day, the date for payment thereof
shall be extended to the next succeeding Euro-Dollar Business Day. If the date
for any payment of principal is extended by operation of law or otherwise,
interest thereon shall be payable for such extended time.

                  (b) Unless the Agent shall have received notice from the
Borrower prior to the date on which any payment is due to the Banks hereunder
that the Borrower will not make such payment in full, the Agent may assume that
the Borrower has made such payment in full to the Agent on such date and the
Agent may, in reliance upon such assumption, cause to be distributed to each
Bank on such due date an amount equal to the amount then due such Bank. If and
to the extent that the Borrower shall not have so made such payment, each Bank
shall repay to the Agent forthwith on demand such amount distributed to such
Bank together with interest thereon, for each day from the date such amount is
distributed to such Bank until the date such Bank repays such amount to the
Agent, at the Federal Funds Rate.

                  SECTION 2.13. Funding Losses. If the Borrower makes any
payment of principal with respect to any Fixed Rate Loan or any Fixed Rate Loan
is converted to a Base Rate Loan (pursuant to Section 2.10, Section 2.11,
Article VI or Article VIII) on any day other than the last day of an Interest
Period applicable thereto or the end of an applicable period fixed pursuant to
Section 2.08(c), or if any Bank assigns any Fixed Rate Loan as required by
Section 8.06 on any day other than the last day of an Interest Period applicable
thereto, or if the Borrower fails to borrow or prepay any Fixed Rate Loan after
notice has been given to any Bank in accordance with Section 2.04(a) or Section
2.11, the Borrower shall reimburse each Bank within 15 days after demand for any
resulting loss or expense incurred by it (or by an existing or prospective
Participant in the related Loan), including (without limitation) any loss
reasonably incurred in
<PAGE>   27
                                                                              23


obtaining, liquidating or employing deposits from third parties, but excluding
loss of margin for the period after such payment or conversion or assignment or
failure to borrow or prepay; provided that such Bank shall have delivered to the
Borrower a certificate as to the amount of such loss or expense with an
explanation of the calculation of such loss or expense, which certificate shall
be conclusive if made reasonably and in good faith.

                  SECTION 2.14. Computation of Interest and Fees. Interest based
on the Prime Rate hereunder shall be computed on the basis of a year of 365 days
(or 366 days in a leap year) and paid for the actual number of days elapsed
(including the first day but excluding the last day). All other interest and
facility fees hereunder shall be computed on the basis of a year of 360 days and
paid for the actual number of days elapsed (including the first day but
excluding the last day).

                  SECTION 2.15. Regulation D Compensation. For each day for
which a Bank is required to maintain reserves in respect of either (x)
"Eurocurrency Liabilities" (as defined in all regulations of the Board of
Governors of the Federal Reserve System) or (y) any other category of
liabilities which includes deposits by reference to which the interest rate in
Euro-Dollar Loans is determined or any category of extensions of credit or other
assets which includes loans by a non-United States office of any Bank to United
States residents, such Bank may require the Borrower to pay, contemporaneously
with each payment of interest on the Euro-Dollar Loans, additional interest on
the related Euro-Dollar Loan of such Bank at a rate per annum determined by such
Bank up to but not exceeding the excess of (i) (A) the applicable London
Interbank Offered Rate divided by (B) one minus the Euro-Dollar Reserve
Percentage over (ii) the applicable London Interbank Offered Rate. Any Bank
wishing to require payment of such additional interest (x) shall so notify the
Borrower and the Agent, in which case such additional interest on the
Euro-Dollar Loans of such Bank shall be payable to such Bank at the place
indicated in such notice with respect to each Interest Period commencing at
least five Euro-Dollar Business Days after the giving of such notice and (y)
shall notify the Borrower at least five Euro-Dollar Business Days prior to each
date on which interest is payable on the Euro-Dollar Loans of the amount then
due to such Bank under this Section. Such Bank's notice to the Borrower shall
set forth its calculation of such additional interest and such calculation shall
be conclusive if made reasonably and in good faith.


                                   ARTICLE III

                                   CONDITIONS

                  SECTION 3.01. Effectiveness. This Agreement shall become
effective on the date that all of the following conditions shall have been
satisfied (or waived in accordance with Section 9.04):

                  (a) receipt by the Agent from each of the parties hereto of
         either (i) a counterpart hereof signed by such party or (ii)
         telegraphic, telex or other written confirmation, in form satisfactory
         to the Agent, confirming that a counterpart hereof has been signed by
         such party;
<PAGE>   28
                                                                              24


                  (b) receipt by the Agent of a certificate signed by the Vice
         Chairman for Strategy and Finance or the Vice President, Finance of the
         Borrower, dated the Effective Date, to the effect that (i) no Default
         has occurred and is continuing as of the Effective Date and (ii) the
         representations and warranties of the Borrower set forth in Article IV
         hereof are true in all material respects on, and as of, the Effective
         Date;

                  (c) receipt by the Agent of an opinion of William C. Baskin
         III, Esq., counsel to the Borrower, of Davis Polk & Wardwell, special
         counsel to the Borrower, and of Drinker Biddle & Reath LLP,
         Pennsylvania counsel to the Borrower, in each case given upon the
         Borrower's express instructions, substantially in the forms of Exhibits
         E-1, E-2 and E-3 hereto, respectively;

                  (d) receipt by the Agent of all documents it may reasonably
         request relating to the existence of the Borrower, the corporate
         authority for and the validity of this Agreement, and any other matters
         relevant hereto, all in form and substance satisfactory to the Agent;

                  (e) the material terms and conditions of the Spin-Off
         Transactions and all material agreements relating thereto
         shall be reasonably satisfactory to the Agent;

                  (f) the fact that the representations and warranties of the
         Borrower set forth in Article IV hereof are true in all material
         respects on and as of the Effective Date;

                  (g) the Banks shall have received the financial
         statements referred to in Section 4.04(a);

                  (h) the Other Credit Agreements shall have been
         executed and delivered by the parties thereto and shall be
         effective;

                  (i) the Borrower shall have terminated all commitments under,
         and paid all amounts accrued and owing under, the Existing Credit
         Agreements; and

                  (j) the Agent shall have received all fees and other amounts
         due and payable by the Borrower on or prior to the Effective Date,
         including, to the extent invoiced, reimbursement or payment of all
         out-of-pocket expenses required to be reimbursed or paid by the
         Borrower;

provided that this Agreement shall not become effective or be binding on any
party hereto unless all of the foregoing conditions are satisfied not later than
January 31, 2001. The Agent shall promptly notify the Borrower and the Banks of
the Effective Date, and such notice shall be conclusive and binding on all
parties hereto.

                  SECTION 3.02. Borrowings. The obligation of any Bank to make a
Loan on the occasion of any Borrowing is subject to the satisfaction of the
following conditions:

                  (a) receipt by the Agent of a Notice of Borrowing as
         required by Section 2.02 or 2.03, as the case may be;
<PAGE>   29
                                                                              25


                  (b) the fact that, immediately before and immediately after
         such Borrowing, no Default shall have occurred and be continuing;

                  (c) the fact that immediately after such Borrowing, the
         aggregate outstanding principal amount of the Loans will not exceed the
         aggregate amount of the Commitments;

                  (d) the fact that the representations and warranties of the
         Borrower set forth in Article IV (other than those set forth in
         Sections 4.04(b) and 4.05) shall be true on and as of the date of such
         Borrowing; and

                  (e) the fact that the Borrowing shall have been approved by
         the Chairman of the board of directors, the President, the Chief
         Executive Officer or the Chief Financial Officer of the Borrower or any
         one of their respective designees.

Each Borrowing hereunder shall be deemed to be a representation and warranty by
the Borrower on the date of such Borrowing as to the facts specified in clauses
(b), (c), (d) and (e) of this Section 3.02.


                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

                  The Borrower represents and warrants that:

                  SECTION 4.01. Corporate Existence and Power. The Borrower (i)
is a Pennsylvania corporation duly incorporated, validly existing and in good
standing under the laws of the State of Pennsylvania, and (ii) has all corporate
powers required to carry on its business as now conducted. Each of the Borrower
and its Consolidated Subsidiaries has all governmental licenses, authorizations,
consents and approvals required to carry on its business as now conducted, the
failure to obtain which would, individually or in the aggregate, have a material
adverse effect on the Borrower's ability to perform its obligations hereunder or
on the financial condition of the Borrower and its Consolidated Subsidiaries,
taken as a whole.

                  SECTION 4.02. Corporate and Governmental Authorization; No
Contravention. The execution, delivery and performance by the Borrower of this
Agreement are within its corporate powers, have been duly authorized by all
necessary corporate action, require no action by or in respect of, or advance
filing with, any governmental body, agency or official and do not contravene, or
constitute a default under, (i) any provision of the certificate of
incorporation or by-laws of the Borrower, (ii) any applicable law or regulation
or any judgment, injunction, order or decree binding upon the Borrower, or (iii)
any material financial agreement or instrument of the Borrower.

                  SECTION 4.03. Binding Effect. This Agreement constitutes a
valid and binding agreement of the Borrower and each Note, when executed and
delivered in accordance with this Agreement, will constitute a valid and binding
obligation of the Borrower, in each case enforceable in accordance with its
terms except as may be limited by bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting the
<PAGE>   30
                                                                              26


enforcement of creditors' rights generally and by general principles of equity.

                  SECTION 4.04. Financial Information. (a) The Borrower has
heretofore furnished to the Agent, for distribution to each of the Banks, (i)
the unaudited consolidated balance sheets for the Business as of December 31,
1999 and June 30, 2000, and related consolidated statements of cash flows,
income and retained earnings for the Business for the twelve-month and six-month
periods then ended, respectively, and (ii) the consolidated balance sheet of the
Parent as of September 30, 2000, and the related consolidated statements of cash
flows, income and retained earnings for the nine-month period then ended, set
forth in the Parent's Form 10-Q for the third quarter of 2000. Such financial
statements present fairly, in all material respects, the consolidated financial
position and results of operations and cash flows of the Business (in the case
of the financial statements referred to in clause (i) above) or the Parent and
its consolidated subsidiaries (in the case of the financial statements referred
to in clause (ii) above), as applicable, as of such dates and for such periods,
in accordance with GAAP subject to year-end audit adjustments and the absence of
footnotes.

                  (b) Since June 30, 2000, there has been no material adverse
change in the business, assets, operations, prospects or condition (financial or
otherwise) of the Business taken as a whole; provided that the charges and other
information disclosed in the Disclosure Documents shall be deemed not to
constitute any such material adverse change.


                  SECTION 4.05. Litigation. Except as disclosed in the
Disclosure Documents and the Parent's Form 10-Q for the third quarter of 2000,
after giving effect to the Spin-Off Transactions there is no action, suit or
proceeding pending against, or to the knowledge of the Borrower, threatened
against or affecting, the Borrower or its Consolidated Subsidiaries before any
court or arbitrator or any governmental body, agency or official in which there
is a reasonable possibility of an adverse decision which could materially
adversely affect the business, consolidated financial position or consolidated
results of operations of the Borrower and its Consolidated Subsidiaries taken as
a whole or which in any manner draws into question the validity of this
Agreement.

                  SECTION 4.06. Compliance with ERISA. Each member of the ERISA
Group has fulfilled its obligations under the minimum funding standards of ERISA
and the Internal Revenue Code with respect to each Plan and is not in violation
of the presently applicable provisions of ERISA and the Internal Revenue Code
where such violation would have a material adverse effect on the financial
condition of the Borrower and its Consolidated Subsidiaries, taken as a whole,
and has not incurred any liability to the PBGC or a Plan under Title IV of
ERISA; provided that this Section 4.06 applies to the members of the ERISA Group
only in their capacity as employers and not in any other capacity (such as
fiduciaries or service providers to Plans for the benefit of employers of
others).

                  SECTION 4.07. Compliance with Laws and Agreements. Each of the
Borrower and its Consolidated Subsidiaries has
<PAGE>   31
                                                                              27


complied in all material respects with all applicable laws and material
agreements binding upon it, except where any failure to comply therewith would
not individually or collectively have a material adverse effect on the
Borrower's ability to perform its obligations hereunder, and except where
necessity of compliance therewith is being contested in good faith by
appropriate proceedings; provided, however, that the sole representation and
warranty with respect to compliance with ERISA is limited to Section 4.06.

                  SECTION 4.08. Investment Company Act; Public Utility Holding
Company Act. The Borrower is not (a) an "investment company" or a company
"controlled" by an "investment company" within the meaning of the Investment
Company Act of 1940, as amended, or (b) a "holding company" as defined in, or
subject to regulation under, the Public Utility Holding Company Act of 1935.

                  SECTION 4.09. Full Disclosure. None of the Disclosure
Documents or any other information furnished in writing by or on behalf of the
Borrower to the Agent or any Bank for purposes of or in connection with this
Agreement (in each case taken as a whole with all other information so
furnished) contained, as of the time it was furnished, any material misstatement
of fact or omitted as of such time to state any material fact necessary to make
the statements therein taken as a whole not misleading, in the light of the
circumstances under which they were made; provided that with respect to
information consisting of statements, estimates and projections regarding the
future performance of the Borrower and its Consolidated Subsidiaries, the
Borrower represents only that such information has been prepared in good faith
based upon assumptions believed by the Borrower to be reasonable at the time of
preparation thereof.

                  SECTION 4.10. Taxes. The Borrower has filed or caused to be
filed all United States Federal income tax returns and all other material tax
returns required to be filed by it and has paid or caused to be paid all
material taxes required to have been paid by it, except taxes that are being
contested in good faith by appropriate proceedings and for which the Borrower
has set aside on its books adequate reserves with respect thereto in accordance
with GAAP.

                  SECTION 4.11. Spin-Off Transactions. As of the close of
business on the Effective Date, the Spin-Off Transactions shall have been
consummated in all material respects in accordance with the Distribution
Agreement and the other material agreements relating thereto.


                                    ARTICLE V

                                    COVENANTS

                  The Borrower agrees that, so long as any Bank has any
Commitment hereunder and so long as any Loan is outstanding hereunder:

                  SECTION 5.01. Information. The Borrower will deliver to the
Agent, for delivery by the Agent to each of the Banks:

                  (a) as soon as available and in any event within 120 days
         after the end of each fiscal year of the Borrower, the
<PAGE>   32
                                                                              28


consolidated balance sheet of the Borrower and its Consolidated Subsidiaries as
of the end of such fiscal year and the related consolidated statements of
earnings and of cash flows for such fiscal year, setting forth in each case in
comparative form the figures for the previous fiscal year, all reported on in a
manner acceptable to the Securities and Exchange Commission by KPMG LLP or other
independent public accountants of nationally recognized standing;

                  (b) as soon as available and in any event within 60 days after
         the end of each of the first three quarters of each fiscal year of the
         Borrower, its Form 10-Q as of the end of such quarter;

                  (c) simultaneously with the delivery of each set of financial
         statements referred to in clauses (a) and (b) above, a certificate of a
         Responsible Financial Officer of the Borrower (i) stating whether any
         Default exists on the date of such certificate and, if any Default then
         exists, setting forth the details thereof and the action which the
         Borrower is taking or proposes to take with respect thereto and (ii)
         setting forth calculations demonstrating compliance, as of the date of
         the most recent balance sheet included in the financial statements
         being furnished at such time, with the covenants set forth in Sections
         5.03, 5.04 and 5.05(e);

                  (d) within five days after any officer of the Borrower obtains
         knowledge of any Default, if such Default is then continuing, a
         certificate of a Responsible Financial Officer of the Borrower setting
         forth the details thereof and the action which the Borrower is taking
         or proposes to take with respect thereto;

                  (e) promptly upon the mailing thereof to the shareholders of
         the Borrower generally, copies of all financial statements and reports,
         and proxy statements so mailed;

                  (f) from time to time such additional publicly available
         information regarding the financial position or business of the
         Borrower and its Consolidated Subsidiaries as the Agent, at the request
         of any Bank, may reasonably request; and

                  (g) prompt written notice after the occurrence of (i) any
         Reportable Event that, alone or together with any other Reportable
         Events that have occurred, or (ii) a failure to make a required
         installment or other payment (within the meaning of Section 412(n)(1)
         of the Internal Revenue Code) that, could reasonably be expected to
         result in liability of the Borrower to the PBGC or to a Plan in an
         aggregate amount exceeding $50,000,000.

                  SECTION 5.02. Conduct of Business and Maintenance of
Existence. The Borrower will preserve, renew and keep in full force and effect,
and will cause each Material Subsidiary to preserve, renew and keep in full
force and effect, their respective corporate existence; provided that the
foregoing shall
<PAGE>   33
                                                                              29


not prohibit (i) the termination of the existence of any Material Subsidiary if
the surviving entity (in the case of any such termination resulting from a
merger or consolidation) or the entity to which substantially all such Material
Subsidiary's assets are transferred (in the case of any other such termination)
is or becomes a Material Subsidiary or is the Borrower or (ii) any transaction
involving the Borrower in accordance with Section 5.06.

                  SECTION 5.03. Minimum Adjusted Consolidated Net Worth.
Adjusted Consolidated Net Worth as of the end of each fiscal quarter of the
Borrower ending on or after December 31, 2000 will not be less than the Minimum
Adjusted Consolidated Net Worth as of the end of such fiscal quarter.

                  SECTION 5.04. Leverage Ratio. The Leverage Ratio as of the end
of each fiscal quarter of the Borrower ending on or after March 31, 2001, will
not exceed 3.0 to 1.0.

                  SECTION 5.05. Liens. The Borrower will not, and will not
permit any Consolidated Subsidiary to, create, incur, assume or permit to exist
any Indebtedness secured by any Lien on any property or asset now owned or
hereafter acquired by it, except:

                  (a) any Indebtedness secured by a Lien on any property or
         asset of the Borrower or any Consolidated Subsidiary existing on the
         date hereof; provided that (i) such Lien shall not apply to any other
         property or asset of the Borrower or any Consolidated Subsidiary and
         (ii) such Lien shall secure only the Indebtedness which it secures on
         the date hereof and extensions, renewals and replacements thereof that
         do not increase the outstanding principal amount thereof;

                  (b) any Indebtedness secured by a Lien existing on any
         property or asset prior to the acquisition thereof by the Borrower or
         any Consolidated Subsidiary or existing on any property or asset of any
         Person that becomes a Consolidated Subsidiary after the date hereof
         prior to the time such Person becomes a Consolidated Subsidiary;
         provided that (i) such Indebtedness and Lien are not created in
         contemplation of or in connection with such acquisition or such Person
         becoming a Consolidated Subsidiary, as the case may be, (ii) such Lien
         shall not apply to any other property or assets of the Borrower or any
         Consolidated Subsidiary and (iii) such Lien shall secure only the
         Indebtedness which it secures on the date of such acquisition or the
         date such Person becomes a Consolidated Subsidiary, as the case may be,
         and extensions, renewals and replacements thereof that do not increase
         the outstanding principal amount thereof;

                  (c) any Indebtedness secured by purchase money security
         interests in property or assets or improvements thereto hereafter
         acquired (or, in the case of improvements, constructed) by the Borrower
         or any Consolidated Subsidiary; provided that (i) such security
         interests and the Indebtedness secured thereby are incurred within 180
         days of such acquisition (or construction), (ii) the Indebtedness
         secured thereby does not exceed the lesser of the cost or the fair
         market value of such property or assets or improvements at the time of
         such acquisition (or construction) and (iii) such security interests do
         not
<PAGE>   34
                                                                              30


         apply to any other property or assets of the Borrower or any
         Consolidated Subsidiary;

                  (d) any capitalized lease obligations secured by Liens;
         provided that such Liens do not extend to any property of the Borrower
         or its Consolidated Subsidiaries other than the property subject to the
         relevant capital lease; and

                  (e) Indebtedness secured by Liens that are not otherwise
         permitted by any of the foregoing provisions of this Section 5.05;
         provided that, at the time that any such Indebtedness is incurred or
         that any such Lien is granted (and after giving effect thereto), the
         aggregate outstanding principal amount of all Indebtedness secured by
         Liens permitted by this paragraph (e) shall not exceed 10% of the
         consolidated shareholders equity of the Borrower as of the most recent
         date for which (i) a pro forma consolidated balance sheet of the
         Borrower has been delivered to the Agent, until the first audited
         consolidated financial statements of the Borrower are delivered to the
         Agent pursuant to Section 5.01(a) or (b) and, thereafter, (ii) a
         consolidated balance sheet of the Borrower has been delivered to the
         Agent pursuant to Section 5.01(a) or (b), determined in accordance with
         GAAP.

                  SECTION 5.06. Consolidations, Mergers and Sales of Assets. The
Borrower will not consolidate or merge with or into any other corporation or
convey or transfer (or permit the conveyance or transfer of) all or
substantially all of the properties and assets of the Borrower and its
Consolidated Subsidiaries to any other Person unless (i) the surviving or
acquiring entity is a corporation organized under the laws of one of the United
States, (ii) the surviving or acquiring corporation, if other than the Borrower,
expressly assumes the performance of the obligations of the Borrower under this
Agreement and all Notes, and (iii) immediately after giving effect to such
transaction, no Default shall exist.

                  SECTION 5.07. Use of Proceeds. The proceeds of the Loans made
under this Agreement will be used by the Borrower for general corporate
purposes. None of such proceeds will be used, directly or indirectly, for the
purpose, whether immediate, incidental or ultimate, of buying or carrying any
"margin stock" within the meaning of Regulation U.

                  SECTION 5.08. Compliance with Laws. The Borrower will comply,
and will cause its Consolidated Subsidiaries to comply, in all material respects
with all applicable laws, except where any failure to comply therewith would not
individually or collectively have a material adverse effect on the Borrower's
ability to perform its obligations hereunder, and except where necessity of
compliance therewith is being contested in good faith by appropriate
proceedings; provided, however, that with respect to compliance with ERISA, this
Section 5.08 applies to the Borrower and its Consolidated Subsidiaries only in
their respective capacities as employers and not in any other capacity (such as
a fiduciary or service provider to Plans for the benefit of employers of
others).

                  SECTION 5.09. Inspection of Property, Books and Records. The
Borrower will keep proper books of record and account in which full, true and
correct entries (in all material
<PAGE>   35
                                                                              31


respects) in conformity with GAAP shall be made of all dealings and transactions
in relation to its business and activities. The Borrower will permit
representatives of any Bank at such Bank's expense to visit and inspect the
Borrower's financial records and properties, to examine and make extracts from
its books and records and to discuss its affairs and financial condition with
the Borrower's officers and (with the participation of or prior notice to such
officers) independent public accountants, all at such reasonable times and as
often as reasonably requested.

                  SECTION 5.10. Payment of Obligations. The Borrower will, and
will cause each of its Consolidated Subsidiaries to, pay its tax liabilities and
other material obligations, before the same shall become delinquent or in
default, except where (a) (i) the validity or amount thereof is being contested
in good faith by appropriate proceedings and (ii) the Borrower or such
Consolidated Subsidiary has set aside on its books adequate reserves with
respect thereto in accordance with GAAP or (b) the failure to make such payments
could not reasonably be expected to have a material adverse effect on the
Borrower's ability to perform its obligations hereunder or on the financial
condition of the Borrower and its Consolidated Subsidiaries, taken as a whole.


                                   ARTICLE VI

                                    DEFAULTS

                  SECTION 6.01. Events of Default. If one or more of the
following events ("Events of Default") shall have occurred and be continuing:

                  (a) the Borrower shall fail to pay when due any
         principal on any Loan;

                  (b) the Borrower shall fail to pay within five
         Domestic Business Days of when due any fees or interest on
         any Loan;

                  (c) the Borrower shall fail to observe or perform any
         covenant contained in Sections 5.01(d), 5.03, 5.04 and 5.06;

                  (d) the Borrower shall fail to observe or perform, in any
         material respect, any covenant or agreement contained in this Agreement
         (other than those covered by clause (a), (b) or (c) above) and such
         failure shall have continued for a period of 30 days after written
         notice thereof has been given to the Borrower by the Agent at the
         request of any Bank;

                  (e) any representation, warranty, certification or statement
         made by the Borrower in this Agreement or in any certificate, financial
         statement or other document delivered pursuant to this Agreement shall
         prove to have been incorrect in any material respect when made (or
         deemed made);

                  (f) the Borrower or any Consolidated Subsidiary shall fail to
         make any payment (whether of principal or interest) in respect of any
         indebtedness for borrowed money having an outstanding principal amount
         of $50,000,000 (or its
<PAGE>   36
                                                                              32


         equivalent in any other currency) or more, when and as the same shall
         become due and payable; or any event or condition occurs that results
         in any outstanding indebtedness for borrowed money of the Borrower or
         any Consolidated Subsidiary having an outstanding principal amount of
         $100,000,000 (or its equivalent in any other currency) or more becoming
         due prior to its scheduled maturity, or that enables or permits the
         holder or holders of such indebtedness or any trustee or agent on its
         or their behalf to cause such indebtedness to become due prior to its
         scheduled maturity;

                  (g) the Borrower or any Material Subsidiary shall commence a
         voluntary case or other proceeding seeking liquidation, reorganization
         or other relief with respect to itself or its debts under any
         bankruptcy, insolvency or other similar law now or hereafter in effect
         or seeking the appointment of a trustee, receiver, liquidator,
         custodian or other similar official of it or all or substantially all
         of its property, or shall consent to any such relief or to the
         appointment of or taking possession by any such official in an
         involuntary case or other proceeding commenced against it, or shall
         make a general assignment for the benefit of creditors, or shall fail
         generally to pay its debts as they become due, or shall take any
         corporate action to authorize any of the foregoing;

                  (h) an involuntary case or other proceeding shall be commenced
         against the Borrower or any Material Subsidiary seeking liquidation,
         reorganization or other relief with respect to it or its debts under
         any bankruptcy, insolvency or other similar law now or hereafter in
         effect or seeking the appointment of a trustee, receiver, liquidator,
         custodian or other similar official of it or all or substantially all
         of its property, and such involuntary case or other proceeding shall
         remain undismissed and unstayed for a period of 60 days; or an order
         for relief shall be entered against the Borrower or any Material
         Subsidiary under the federal bankruptcy laws as now or hereafter in
         effect;

                  (i) any person or group of persons (within the meaning of
         Section 13 or 14 of the Securities Exchange Act of 1934, as amended)
         shall have acquired beneficial ownership (within the meaning of Rule
         13d-3 promulgated by the Securities and Exchange Commission under said
         Act) of more than 35% of the outstanding shares of common stock of the
         Borrower; or at any time Continuing Directors shall not constitute a
         majority of the board of directors of the Borrower;

                  (j) one or more judgments for the payment of money in an
         aggregate amount in excess of $50,000,000 (or its equivalent in any
         other currency) shall be rendered against the Borrower, any
         Consolidated Subsidiary or any combination thereof and the same shall
         remain undischarged for a period of 60 consecutive days during which
         execution shall not be effectively stayed, or any action shall be
         legally taken by a judgment creditor to levy upon assets or properties
         of the Borrower or any Consolidated Subsidiary to enforce any such
         judgment; or

                  (k) a Reportable Event or Reportable Events, or a failure to
         make a required installment or other payment
<PAGE>   37
                                                                              33


         (within the meaning of Section 412(n)(1) of the Internal Revenue Code),
         shall have occurred with respect to any Plan or Plans that reasonably
         could be expected to result in liability of the Borrower to the PBGC or
         to a Plan in an aggregate amount exceeding $50,000,000 and, within 30
         days after the reporting of any such Reportable Event to the Agent, the
         Agent shall have notified the Borrower in writing that (i) the Required
         Banks have made a determination that, on the basis of such Reportable
         Event or Reportable Events or the failure to make a required payment,
         there are reasonable grounds (A) for the termination of such Plan or
         Plans by the PBGC, (B) for the appointment by the appropriate United
         States District Court of a trustee to administer such Plan or Plans or
         (C) for the imposition of liens in an amount exceeding $25,000,000 in
         favor of a Plan and (ii) as a result thereof an Event of Default exists
         hereunder; or a trustee shall be appointed by a United States District
         Court to administer any such Plan or Plans; or the PBGC shall institute
         proceedings to terminate any Plan or Plans;

then, and in every such event, the Agent shall (i) if requested by Banks having
more than 50% in aggregate amount of the Commitments, by notice to the Borrower
terminate the Commitments and they shall thereupon terminate, and (ii) if
requested by Banks holding more than 50% in aggregate principal amount of the
Loans, by notice to the Borrower declare the Loans (together with accrued
interest thereon) to be, and the Loans (together with accrued interest thereon)
shall thereupon become, immediately due and payable without presentment, demand,
protest or other notice of any kind, all of which are hereby waived by the
Borrower; provided that in the case of any of the Events of Default specified in
clause (g) or (h) above with respect to the Borrower, without any notice to the
Borrower or any other act by the Agent or the Banks, the Commitments shall
thereupon terminate and the Loans (together with accrued interest thereon) shall
become immediately due and payable without presentment, demand, protest or other
notice of any kind, all of which are hereby waived by the Borrower.

                  SECTION 6.02. Notice of Default. The Agent shall give notice
to the Borrower under Section 6.01(d) promptly upon being requested to do so by
any Bank and shall thereupon notify all the Banks thereof.


                                   ARTICLE VII

                                    THE AGENT

                  SECTION 7.01. Appointment and Authorization. Each Bank
irrevocably appoints and authorizes the Agent to take such action as agent on
its behalf and to exercise such powers under this Agreement as are delegated to
the Agent by the terms hereof, together with all such powers as are reasonably
incidental thereto.

                  SECTION 7.02. Agent and Affiliates. Morgan Guaranty Trust
Company of New York shall have the same rights and powers under this Agreement
as any other Bank and may exercise or refrain from exercising the same as though
it were not the Agent, and Morgan Guaranty Trust Company of New York and its
affiliates may accept deposits from, lend money to, and generally engage in
<PAGE>   38
                                                                              34


any kind of business with the Borrower or any Subsidiary or affiliate of the
Borrower as if it were not the Agent hereunder.

                  SECTION 7.03. Action by Agent. The obligations of the Agent
hereunder are only those expressly set forth herein. Without limiting the
generality of the foregoing, the Agent shall not be required to take any action
with respect to any Default, except as expressly provided in Article VI.

                  SECTION 7.04. Consultation with Experts. The Agent may consult
with legal counsel (who may be counsel for the Borrower), independent public
accountants and other experts selected by it and shall not be liable for any
action taken or omitted to be taken by it in good faith in accordance with the
advice of such counsel, accountants or experts.

                  SECTION 7.05. Liability of Agent. Neither the Agent nor any of
its directors, officers, agents, or employees shall be liable for any action
taken or not taken by it in connection herewith (i) with the consent or at the
request of the Required Banks or (ii) in the absence of its own gross negligence
or willful misconduct. Neither the Agent nor any of its directors, officers,
agents or employees shall be responsible for or have any duty to ascertain,
inquire into or verify (i) any statement, warranty or representation made in
connection with this Agreement or any Borrowing hereunder; (ii) the performance
or observance of any of the covenants or agreements of the Borrower; (iii) the
satisfaction of any condition specified in Article III, except receipt of items
required to be delivered to the Agent; or (iv) the validity, effectiveness or
genuineness of this Agreement or any other instrument or writing furnished in
connection herewith. The Agent shall not incur any liability by acting in
reliance upon any notice, consent, certificate, statement, or other writing
(which may be a bank wire, telex or similar writing) reasonably believed by it
to be genuine and to be signed by the proper party or parties.

                  SECTION 7.06. Indemnification. Each Bank shall, ratably in
accordance with its Commitment, indemnify the Agent (to the extent not
reimbursed by the Borrower) against any cost, expense (including counsel fees
and disbursements), claim, demand, action, loss or liability (except such as
result from the Agent's gross negligence or willful misconduct) that the Agent
may suffer or incur in connection with this Agreement or any action taken or
omitted by the Agent hereunder.

                  SECTION 7.07. Credit Decision. Each Bank acknowledges that it
has, independently and without reliance upon the Agent or any other Bank, and
based on such documents and information as it has deemed appropriate, made its
own credit analysis and decision to enter into this Agreement. Each Bank also
acknowledges that it will, independently and without reliance upon the Agent or
any other Bank, and based on such documents and information as it shall deem
appropriate at the time, continue to make its own credit decisions in taking or
not taking any action under this Agreement.

                  SECTION 7.08. Successor Agent. The Agent may resign at any
time by giving written notice thereof to the Banks and the Borrower. Upon any
such resignation, the Required Banks shall have the right to appoint a successor
Agent approved by the Borrower (which approval shall not be unreasonably
withheld). If no successor Agent shall have been so appointed by the Required
<PAGE>   39
                                                                              35


Banks, and approved by the Borrower and shall have accepted such appointment
within 30 days after the retiring Agent gives notice of resignation, then the
retiring Agent may, on behalf of the Banks, appoint a successor Agent, which
shall be a commercial bank organized or licensed under the laws of the United
States of America or of any State thereof and having a combined capital and
surplus of at least two billion dollars. Upon the acceptance of its appointment
as Agent hereunder by a successor Agent, such successor Agent shall thereupon
succeed to and become vested with all the rights and duties of the retiring
Agent, and the retiring Agent shall be discharged from its duties and
obligations hereunder. After any retiring Agent's resignation hereunder as
Agent, the provisions of this Article shall inure to its benefit as to any
actions taken or omitted to be taken by it while it was Agent.

                  SECTION 7.09. Agent's Fees. The Borrower shall pay to the
Agent, for its own account, fees in the amounts and at the times previously
agreed upon between the Borrower and the Agent.


                                  ARTICLE VIII

                             CHANGE IN CIRCUMSTANCES

                  SECTION 8.01. Basis for Determining Interest Rate Inadequate
or Unfair. If on or prior to the first day of any Interest Period for any
Euro-Dollar Loan or Money Market LIBOR Loan the Agent determines (which
determination shall be conclusive absent manifest error) that deposits in
dollars (in the applicable amounts) are not generally available in the London
interbank market for such period or that the London Interbank Offered Rate
cannot be determined in accordance with the definition thereof, the Agent shall
forthwith give notice thereof to the Borrower and the Banks, whereupon until the
Agent notifies the Borrower that the circumstances giving rise to such
suspension no longer exist, (i) the obligations of the Banks to make Euro-Dollar
Loans, to convert outstanding Base Rate Loans into Euro-Dollar Loans or to
convert outstanding Euro-Dollar Loans into Euro-Dollar Loans with a different
Interest Period shall be suspended, (ii) each outstanding Euro-Dollar Loan or
Money Market LIBOR Loan, as the case may be, shall be converted into a Base Rate
Loan on the last day of the then current Interest Period applicable thereto, and
(iii) unless the Borrower notifies the Agent at least two Domestic Business Days
before the date of any Euro-Dollar Borrowing or Money Market LIBOR Borrowing, as
the case may be, for which a Notice of Borrowing has previously been given that
it elects not to borrow on such date, (x) if such Borrowing is a Euro-Dollar
Borrowing, such Borrowing shall instead be made as a Base Rate Borrowing and (y)
if such Borrowing is a Money Market LIBOR Borrowing, the Money Market LIBOR
Loans comprising such Borrowing shall bear interest for each day from and
including the first day to but excluding the last day of the Interest Period
applicable thereto at the Base Rate for such day.

          SECTION 8.02. Illegality. If, on or after the date of this Agreement,
the adoption of any applicable law, rule or regulation, or any change in any
applicable law, rule or regulation, or any change in the interpretation or
administration thereof by any governmental authority, central bank or comparable
agency charged with the interpretation or administration thereof, or compliance
by any Bank (or its Applicable Lending Office) with
<PAGE>   40
                                                                              36


any request or directive (whether or not having the force of law) of any such
authority, central bank or comparable agency shall make it unlawful or
impossible for any Bank (or its Euro-Dollar Lending Office) to make, maintain or
fund its Euro-Dollar Loans and such Bank shall so notify the Agent, the Agent
shall forthwith give notice thereof to the other Banks and the Borrower,
whereupon until such Bank notifies the Borrower and the Agent that the
circumstances giving rise to such suspension no longer exist, the obligation of
such Bank to make Euro-Dollar Loans, or to convert outstanding Base Rate Loans
into Euro-Dollar Loans, or to convert outstanding Euro-Dollar Loans into Euro-
Dollar Loans with a different Interest Period shall be suspended. Before giving
any notice to the Agent pursuant to this Section 8.02, such Bank shall designate
a different Applicable Lending Office if such designation will avoid the need
for giving such notice and will not, in the judgment of such Bank, be otherwise
disadvantageous to such Bank. If such notice is given, all Euro- Dollar Loans of
such Bank then outstanding shall be converted to Base Rate Loans either (a) on
the last day of the then current Interest Period applicable to such Euro-Dollar
Loans if such Bank may lawfully continue to maintain and fund such Loans to such
day or (b) immediately if such Bank may not lawfully continue to maintain and
fund such Loans to such day.

                  SECTION 8.03. Increased Cost and Reduced Return. (a) If any
applicable law, rule or regulation, or any change in any applicable law, rule or
regulation, or any change in the interpretation or administration thereof by any
governmental authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Bank (or its
Applicable Lending Office) with any request or directive (whether or not having
the force of law) of any such governmental authority, central bank or comparable
agency, made or adopted after the date hereof (other than a change currently
provided for in any existing law, rule or regulation) shall impose, modify or
deem applicable any reserve, special deposit, insurance assessment or similar
requirement (including, without limitation, any such requirement imposed by the
Board of Governors of the Federal Reserve System, but excluding, with respect to
any Euro-Dollar Loan, any such requirement with respect to which such Bank is
entitled to compensation during the relevant Interest Period under Section 2.15)
against assets of, deposits with or for the account of, or credit extended by,
any Bank (or its Applicable Lending Office) or shall impose on any Bank (or its
Applicable Lending Office) or on the United States market for certificates of
deposit or the London interbank market any other condition affecting its Fixed
Rate Loans (other than Money Market Absolute Rate Loans), its Note (in respect
of such Fixed Rate Loans) or its obligation to make such Fixed Rate Loans; and
the result of any of the foregoing is to increase the cost to such Bank (or its
Applicable Lending Office) of making or maintaining any Fixed Rate Loan, or to
reduce the amount of any sum received or receivable by such Bank (or its
Applicable Lending Office) under this Agreement or under its Note with respect
thereto, by an amount reasonably deemed by such Bank to be material, then,
within 15 days after demand by such Bank (with a copy to the Agent), the
Borrower shall pay to such Bank such additional amount or amounts as will
compensate such Bank for such increased cost or reduction.

                  (b) If any Bank shall have determined that any applicable law,
rule or regulation regarding capital adequacy, or any change in any such law,
rule or regulation, or any change in
<PAGE>   41
                                                                              37


the interpretation or administration thereof by any governmental authority,
central bank or comparable agency charged with the interpretation or
administration thereof, or any request or directive regarding capital adequacy
(whether or not having the force of law) of any such governmental authority,
central bank or comparable agency, made or adopted after the date hereof (other
than a change currently provided for in any existing law, rule or regulation),
has or would have the effect of increasing the amount of capital of such Bank
(or its parent) required to be maintained in respect of, or otherwise allocated
to, such Bank's obligations hereunder (its "Required Capital") by an amount
reasonably deemed by such Bank to be material, then such Bank may, by notice to
the Borrower and the Agent, increase the facility fee payable to such Bank
hereunder to the extent required so that the ratio of (w) the sum of the
increased facility fee applicable to such Bank's Commitment hereunder to (x) the
prior facility fee applicable to such Bank's Commitment hereunder is the same as
the ratio of (y) such Bank's increased Required Capital to (z) its prior
Required Capital. Such Bank's notice to the Borrower and the Agent shall set
forth its calculation of the foregoing ratios and the increased facility fee to
which it is entitled under this Section.

                  (c) Each Bank will promptly notify the Borrower and the Agent
of any event of which it has knowledge, occurring after the date hereof, which
will entitle such Bank to compensation pursuant to this Section 8.03 (each, a
"Trigger Event") and will designate a different Applicable Lending Office if
such designation will avoid the need for, or reduce the amount of, such
compensation and will not, in the judgment of such Bank, be otherwise
disadvantageous to such Bank. Notwithstanding any other provision of this
Section, no Bank shall be entitled to any compensation pursuant to this Section
in respect of any Trigger Event (i) for any period of time in excess of 120 days
prior to such notice or (ii) for any period of time prior to such notice if such
Bank shall not have given such notice within 120 days of the date on which such
Trigger Event shall have been enacted, promulgated, adopted or issued in
definitive or final form unless such Trigger Event is retroactive. A certificate
of any Bank claiming compensation under Section 8.03(a) or (b) and setting forth
the additional amount or amounts to be paid to it hereunder and describing the
method of calculation thereof shall be conclusive if made reasonably and in good
faith. In determining such amount, such Bank may use any reasonable averaging
and attribution methods.

                  SECTION 8.04. Taxes. (a) For purposes of this Section 8.04,
the following terms have the following meanings:

                  "Taxes" means any and all present or future taxes, duties,
levies, imposts, deductions, charges or withholdings with respect to any payment
by the Borrower pursuant to this Agreement or under any Note, and all
liabilities with respect thereto, excluding (i) in the case of each Bank and the
Agent, taxes imposed on its income, and franchise or similar taxes imposed on
it, by a jurisdiction under the laws of which such Bank or the Agent (as the
case may be) is organized or in which its principal executive office is located
or, in the case of each Bank, in which its Applicable Lending Office is located
and (ii) in the case of each Bank, any United States withholding tax imposed on
such payments but only to the extent that such Bank is subject to United States
withholding tax at the time such Bank first becomes a party to this Agreement.
<PAGE>   42
                                                                              38


                  "Other Taxes" means any present or future stamp or documentary
taxes and any other excise or property taxes, or similar charges or levies,
which arise from any payment made pursuant to this Agreement or under any Note
or from the execution or delivery of, or otherwise with respect to, this
Agreement or any Note.

                  (b) Any and all payments by the Borrower to or for the account
of any Bank or the Agent hereunder or under any Note shall be made without
deduction for any Taxes or Other Taxes; provided that, if the Borrower shall be
required by law to deduct any Taxes or Other Taxes from any such payments, (i)
the sum payable shall be increased as necessary so that after making all
required deductions (including deductions applicable to additional sums payable
under this Section 8.04) such Bank or the Agent (as the case may be) receives an
amount equal to the sum it would have received had no such deductions been made,
(ii) the Borrower shall make such deductions, (iii) the Borrower shall pay the
full amount deducted to the relevant taxation authority or other authority in
accordance with applicable law and (iv) the Borrower shall furnish to the Agent,
at its address referred to in Section 9.01, the original or a certified copy of
a receipt evidencing payment thereof.

                  (c) The Borrower agrees to indemnify each Bank and the Agent
for the full amount of Taxes or Other Taxes (including, without limitation, any
Taxes or Other Taxes imposed or asserted by any jurisdiction on amounts payable
under this Section 8.04) paid by such Bank or the Agent (as the case may be) and
any liability (including penalties, interest and expenses, except to the extent
attributable to the negligence or misconduct of such Bank or the Agent, as the
case may be) arising therefrom or with respect thereto. This indemnification
shall be made within 15 days from the date such Bank or the Agent (as the case
may be) makes demand therefor.

                  (d) Each Bank organized under the laws of a jurisdiction
outside the United States, on or prior to the date of its execution and delivery
of this Agreement in the case of each Bank listed on the signature pages hereof
and on or prior to the date on which it becomes a Bank in the case of each other
Bank, shall provide the Borrower with (i) two Internal Revenue Service ("IRS")
forms W8-BEN or any successor form prescribed by the IRS, certifying that such
Bank is entitled to benefits under an income tax treaty to which the United
States is a party which exempts such Bank from United States withholding tax or
reduces the rate of withholding tax on payments of interest and eliminates
withholding tax on any fees, or (ii) two IRS forms W8-ECI certifying that the
income receivable pursuant to this Agreement is effectively connected with the
conduct of a trade or business in the United States. If the form provided by a
Bank indicates a United States interest withholding tax rate in excess of zero,
withholding tax at such rate shall be considered excluded from "Taxes" as
defined in Section 8.04(a). Each such Bank undertakes to deliver to each of the
Borrower and the Agent (A) a replacement form (or successor form) on or before
the date that such form expires or becomes obsolete or after the occurrence of
any event requiring a change in the most recent form so delivered by it, and (B)
such amendments thereto or extensions or renewals thereof as may reasonably be
required (but only so long as such Bank remains lawfully able to do so).
<PAGE>   43
                                                                              39


                  (e) For any period with respect to which a Bank has failed to
provide the Borrower with the appropriate form pursuant to Section 8.04(d)
(unless such failure is due to a change in treaty, law or regulation occurring
subsequent to the date on which a form originally was required to be provided),
such Bank shall not be entitled to indemnification under Section 8.04(b) or
Section 8.04(c) with respect to Taxes imposed by the United States; provided
that if a Bank, which is otherwise exempt from or subject to a reduced rate of
withholding tax, becomes subject to Taxes because of its failure to deliver a
form required hereunder, the Borrower shall take such steps as such Bank shall
reasonably request to assist such Bank to recover such Taxes.

                  (f) Each Bank will promptly notify the Borrower and the Agent
of any event of which it has knowledge, occurring after the date hereof, which
will entitle such Bank to make any claim for indemnification in respect of Taxes
or Other Taxes pursuant to this Section 8.04 (each, a "Tax Event") and will
designate a different Applicable Lending Office if such designation will avoid
the need for, or reduce the amount of, such claim or any other amounts payable
by the Borrower under this Section 8.04 and will not, in the judgment of such
Bank, be otherwise disadvantageous to such Bank. Notwithstanding any other
provisions of this Section, no Bank shall be entitled to any indemnification
pursuant to this Section in respect of any Tax Event (i) for any period of time
in excess of 180 days prior to such notice or (ii) for any period of time prior
to such notice if such Bank shall not have given such notice within 120 days of
the date on which such Bank became aware of such Tax Event unless such Tax Event
is retroactive.

                  SECTION 8.05. Base Rate Loans Substituted for Affected
Euro-Dollar Loans. If (i) the obligation of any Bank to make or maintain
Euro-Dollar Loans has been suspended pursuant to Section 8.02 or (ii) any Bank
has demanded compensation under Section 8.03(a) and the Borrower shall, by at
least five Euro-Dollar Business Days prior notice to such Bank through the
Agent, have elected that the provisions of this Section shall apply to such
Bank, then, unless and until such Bank notifies the Borrower that the
circumstances giving rise to such suspension or demand for compensation no
longer apply:

                  (a) all Loans which would otherwise be made by such Bank as
         (or continued as or converted into) Euro-Dollar Loans shall instead be
         Base Rate Loans, and

                  (b) after each of its outstanding Euro-Dollar Loans has been
         repaid (or converted to a Base Rate Loan), all payments of principal
         which would otherwise be applied to repay such Euro-Dollar Loans shall
         be applied to repay its Base Rate Loans instead.

If such Bank notifies the Borrower that the circumstances giving rise to such
notice no longer apply, the Borrower shall elect that the principal amount of
each such Base Rate Loan shall be converted into a Euro-Dollar Loan on the first
day of the next succeeding Interest Period applicable to the related Euro-Dollar
Loans of the other Banks.

                  SECTION 8.06. Substitution of Bank. If (i) the obligation of
any Bank to make Euro-Dollar Loans has been suspended pursuant to Section 8.02
or (ii) any Bank has demanded compensation under Section 8.03 or 8.04, the
Borrower shall have
<PAGE>   44
                                                                              40


the right to seek a substitute bank or banks ("Substitute Banks") (which may be
one or more of the Banks) to purchase the Loans and assume the Commitment of
such Bank (the "Affected Bank") under this Agreement and, if the Borrower
locates a Substitute Bank, the Affected Bank shall, upon payment to it of the
purchase price agreed between it and the Substitute Bank (or, failing such
agreement, a purchase price in the amount of the outstanding principal amount of
its Loans and accrued interest thereon to the date of payment) plus any amount
(other than principal and interest) then due to it or accrued for its account
hereunder, assign all its rights and obligations under this Agreement and all of
its Notes to the Substitute Bank, and the Substitute Bank shall assume such
rights and obligations, whereupon the Substitute Bank shall be a Bank party to
this Agreement and shall have all the rights and obligations of a Bank.

                  SECTION 8.07. Election to Terminate. If during any Level I
Period, Level II Period or Level III Period (i) the obligation of any Bank to
make Euro-Dollar Loans has been suspended pursuant to Section 8.02 or (ii) any
Bank has demanded compensation under Section 8.03 or 8.04, the Borrower may
elect to terminate this Agreement as to such Bank, and in connection therewith
not to borrow any Loan hereunder from such Bank or to prepay any Base Rate Loan
made pursuant to Section 8.02 or 8.05 (without altering the Commitments or Loans
of the remaining Banks); provided that the Borrower (i) notifies such Bank
through the Agent of such election at least two Euro-Dollar Business Days before
any date fixed for such borrowing or such a prepayment, as the case may be, and
(ii) repays all of such Bank's outstanding Loans, accrued interest thereon and
any other amounts then due to such Bank or accrued for its account hereunder
concurrently with such termination. Upon receipt by the Agent of such notice,
the Commitment of such Bank shall terminate.


                                   ARTICLE IX

                                  MISCELLANEOUS

                  SECTION 9.01. Notices. All notices, requests and other
communications to any party hereunder shall be in writing (including bank wire,
telex, facsimile transmission or similar writing) and shall be given to such
party: (x) in the case of the Borrower or the Agent, at its address or telex or
telecopy number set forth on the signature pages hereof, (y) in the case of any
Bank, at its address, telex or telecopy number set forth in its Administrative
Questionnaire or (z) in the case of any party, such other address or telex or
telecopy number as such party may hereafter specify for the purpose by notice to
the Agent and the Borrower. All notices from outside the United States to the
Borrower shall only be given by telecopy and all other notices to the Borrower
given by telex shall also be given by telecopy or non-telex method. Each such
notice, request or other communication shall be effective (i) if given by telex
or telecopy, when such telex or telecopy is transmitted to the number determined
pursuant to this Section and the appropriate answerback is received, (ii) if
given by registered or certified mail, return receipt requested, when such
return receipt is signed by the recipient or (iii) if given by any other means,
when delivered at the address specified in this Section, or, if such date is not
a business day in the location where received, on the next business day in such
location; provided that notices
<PAGE>   45
                                                                              41


to the Agent under Article II or Article VIII shall not be effective until
received.

                  SECTION 9.02. No Waivers. No failure or delay by the Agent or
any Bank in exercising any right, power or privilege hereunder or under any Note
shall operate as a waiver thereof nor shall any single or partial exercise
thereof preclude any other or further exercise thereof or the exercise of any
other right, power or privilege. The rights and remedies herein provided shall
be cumulative and not exclusive of any rights or remedies provided by law.

                  SECTION 9.03. Expenses; Indemnification. (a) The Borrower
shall pay (i) all out-of-pocket expenses of the Agent, including reasonable fees
and disbursements of special counsel for the Agent, in connection with the
preparation of this Agreement, any waiver or consent hereunder or any amendment
hereof or any Default or alleged Default hereunder and (ii) if an Event of
Default occurs, all out-of-pocket expenses incurred by the Agent or any Bank,
including fees and disbursements of counsel, in connection with such Event of
Default and collection and other enforcement proceedings resulting therefrom.

                  (b) The Borrower agrees to indemnify each Bank and hold each
Bank harmless from and against any and all liabilities, claims, losses, damages,
costs and expenses of any kind, including, without limitation, the reasonable
fees and disbursements of counsel, which may be incurred by any Bank (or by the
Agent in connection with its actions as Agent hereunder) in connection with any
investigative, administrative or judicial proceeding (whether or not such Bank
shall be designated a party thereto) relating to or arising out of (i) the
Spin-Off Transactions or the Merger, (ii) any actual or proposed use of proceeds
of Loans hereunder to acquire equity securities of any other Person or (iii) any
transaction which violates the change in control provisions set forth in Section
6.01(i); provided that no Bank shall have the right to be indemnified hereunder
for its own gross negligence or willful misconduct as determined by a court of
competent jurisdiction.

                  SECTION 9.04. Amendments and Waivers. Any provision of this
Agreement or the Notes may be amended or waived if, but only if, such amendment
or waiver is in writing and is signed by the Borrower and the Required Banks
(and, if the rights or duties of the Agent are affected thereby, by the Agent);
provided that no such amendment or waiver shall, unless signed by all the Banks,
(i) increase or decrease the Commitment of any Bank or subject any Bank to any
additional obligation, (ii) reduce or forgive the principal of or rate of
interest on any Loan or any fees hereunder, (iii) postpone the date fixed for
any payment of principal of or interest on any Loan or any fees hereunder or for
any reduction or termination of any Commitment or (iv) amend this Section or
otherwise change the percentage of the Commitments or of the aggregate unpaid
principal amount of the Loans, or the number of Banks, which shall be required
for the Banks or any of them to take any action under this Section or any other
provision of this Agreement.

                  SECTION 9.05. Successors and Assigns. (a) The provisions of
this Agreement shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and assigns permitted hereby, except that
the Borrower may not assign or otherwise transfer any of its rights or
obligations hereunder without the prior written consent of each Bank (and any
<PAGE>   46
                                                                              42


attempted assignment or transfer by the Borrower without such consent shall be
null and void), except as contemplated by Section 5.06. Nothing in this
Agreement, expressed or implied, shall be construed to confer upon any Person
(other than the parties hereto and their respective successors and assigns
permitted hereby) any legal or equitable right, remedy or claim under or by
reason of this Agreement.

                  (b) Any Bank may assign to one or more assignees all or a
portion of its rights and obligations under this Agreement (including all or a
portion of its Commitment and the Loans at the time owing to it); provided that
(i) except in the case of an assignment to a Bank or an affiliate of a Bank,
each of the Borrower and the Agent must give their prior written consent to such
assignment (which consent shall not be unreasonably withheld, it being
understood that it shall be reasonable for the Borrower to withhold consent if
the proposed assignee does not have an investment grade rating), (ii) except in
the case of an assignment to a Bank or an affiliate of a Bank or an assignment
of the entire remaining amount of the assigning Bank's Commitment, the amount of
the Commitment of the assigning Bank subject to each such assignment (determined
as of the date the assignment and acceptance with respect to such assignment is
delivered to the Agent) shall not be less than $5,000,000 unless each of the
Borrower and the Agent otherwise consent, (iii) each partial assignment shall be
made as an assignment of a proportionate part of all the assigning Bank's rights
and obligations under this Agreement, except that this clause (iii) shall not
apply to rights in respect of outstanding Money Market Loans, (iv) the parties
to each assignment shall execute and deliver to the Agent an assignment and
acceptance (in a form reasonably satisfactory to the Agent), together with a
processing and recordation fee of $3,500 (except that such fee shall not be
payable in the case of an assignment by a Bank to one of its affiliates or to
another Bank), and (v) the assignee, if it shall not be a Bank, shall deliver to
the Agent an Administrative Questionnaire; and provided further that any consent
of the Borrower otherwise required under this paragraph shall not be required if
an Event of Default under clause (a), (b), (g) or (h) of Section 6.01 has
occurred and is continuing. Subject to acceptance and recording thereof pursuant
to paragraph (d) of this Section, from and after the effective date specified in
each assignment and acceptance the assignee thereunder shall be a party hereto
and, to the extent of the interest assigned by such assignment and acceptance,
have the rights and obligations of a Bank under this Agreement, and the
assigning Bank thereunder shall, to the extent of the interest assigned by such
assignment and acceptance, be released from its obligations under this Agreement
(and, in the case of an assignment and acceptance covering all of the assigning
Bank's rights and obligations under this Agreement, such Bank shall cease to be
a party hereto but shall continue to be entitled to the benefits of Sections
2.13, 8.03, 8.05 and 9.03). Any assignment or transfer by a Bank of rights or
obligations under this Agreement that does not comply with this paragraph shall
be treated for purposes of this Agreement as a sale by such Bank of a
participation in such rights and obligations in accordance with paragraph (e) of
this Section.

                  (c) The Agent, acting for this purpose as an agent of the
Borrower, shall maintain at one of its offices in The City of New York a copy of
each assignment and acceptance delivered to it and a register for the
recordation of the names and addresses of
<PAGE>   47
                                                                              43


the Banks, and the Commitment of, and principal amount of the Loans owing to,
each Bank pursuant to the terms hereof from time to time (the "Register"). The
entries in the Register shall be conclusive, and the Borrower, the Agent and the
Banks may treat each Person whose name is recorded in the Register pursuant to
the terms hereof as a Bank hereunder for all purposes of this Agreement,
notwithstanding notice to the contrary. The Register shall be available for
inspection by the Borrower and any Bank, at any reasonable time and from time to
time upon reasonable prior notice.

                  (d) Upon its receipt of a duly completed assignment and
acceptance executed by an assigning Bank and an assignee, the assignee's
completed Administrative Questionnaire (unless the assignee shall already be a
Bank hereunder), the processing and recordation fee referred to in paragraph (b)
of this Section and any written consent to such assignment required by paragraph
(b) of this Section, the Agent shall accept such assignment and acceptance and
record the information contained therein in the Register. No assignment shall be
effective for purposes of this Agreement unless it has been recorded in the
Register as provided in this paragraph.

                  (e)  Any Bank may, without the consent of the Borrower
or the Agent, sell participations to one or more banks or other entities (a
"Participant") in all or a portion of such Bank's rights and obligations under
this Agreement (including all or a portion of its Commitment and the Loans owing
to it); provided that (i) such Bank's obligations under this Agreement shall
remain unchanged, (ii) such Bank shall remain solely responsible to the other
parties hereto for the performance of such obligations and (iii) the Borrower,
the Agent and the other Banks shall continue to deal solely and directly with
such Bank in connection with such Bank's rights and obligations under this
Agreement. Any agreement or instrument pursuant to which a Bank sells such a
participation shall provide that such Bank shall retain the sole right to
enforce this Agreement and to approve any amendment, modification or waiver of
any provision of this Agreement; provided that such agreement or instrument may
provide that such Bank will not, without the consent of the Participant, agree
to any amendment, modification or waiver described in the first proviso to
Section 9.04 that affects such Participant. Subject to paragraph (f) of this
Section, the Borrower agrees that each Participant shall be entitled to the
benefits of Sections 2.13, 2.15, 8.03 and 8.04 to the same extent as if it were
a Bank and had acquired its interest by assignment pursuant to paragraph (b) of
this Section.

                  (f) A Participant shall not be entitled to receive any greater
payment under Section 8.03 or 8.04 than the applicable Bank would have been
entitled to receive with respect to the participation sold to such Participant,
unless the sale of the participation to such Participant is made with the
Borrower's prior written consent or by reason of the provisions of Section 8.02,
8.03 or 8.04 requiring such Bank to designate a different Applicable Lending
Office under certain circumstances.

                  (g) Any Bank may at any time pledge or assign a security
interest in all or any portion of its rights under this Agreement to secure
obligations of such Bank, including any pledge or assignment to secure
obligations to a Federal Reserve Bank, and this Section shall not apply to any
such pledge or assignment of a security interest; provided that no such pledge
<PAGE>   48
                                                                              44


or assignment of a security interest shall release a Bank from any of its
obligations hereunder or substitute any such pledgee or assignee for such Bank
as a party hereto.

                  SECTION 9.06. New York Law. This Agreement shall be construed
in accordance with and governed by the law of the State of New York.

                  SECTION 9.07. Counterparts; Integration. This Agreement may be
signed in any number of counterparts, each of which shall be an original, with
the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement constitutes the entire agreement and understanding
among the parties hereto and supersedes any and all prior agreements and
understandings, oral or written, relating to the subject matter hereof.

                  SECTION 9.08. WAIVER OF JURY TRIAL. EACH OF THE BORROWER, THE
AGENT AND THE BANKS HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY
IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE
TRANSACTIONS CONTEMPLATED HEREBY.
<PAGE>   49
                                                                              45


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


                                          AETNA U.S. HEALTHCARE INC.,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          Aetna U.S. Healthcare Inc.
                                          151 Farmington Avenue, RE6A
                                          Hartford, CT 06156
                                          Attention: Vice President,
                                                     Finance
                                          Telecopier:  (860) 273-1314
                                          Telex:  99 241

                                          with a copy to:

                                          Aetna U.S. Healthcare Inc.
                                          151 Farmington Avenue, RC4A
                                          Hartford, CT 06156
                                          Attention:  General Counsel
                                          Telecopier:  (860) 273-8340
                                          Telex:  99 241

                                          MORGAN GUARANTY TRUST COMPANY OF NEW
                                          YORK, individually and as Agent,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                          Morgan Guaranty Trust Company of
                                          New York
                                          60 Wall Street, 5th Floor
                                          New York, NY  10260-0060
                                          Attention:  Maria Dell'aquila,
                                                      Vice President
                                          Telecopier: (212) 648-2291
                                          Telex: 177615 MGT UT or 620106
                                            MGT UW
                                          Email: dellaquila_maria@jpmorgan.com

                                          with a copy to:

                                          Morgan Guaranty Trust Company of
                                          New York
                                          c/o J.P. Morgan Services Inc.
                                          500 Stanton Christiana Road
                                          Newark, DE  19713-2107
                                          Attention:  Nancy Baiz,
                                            Associate
                                          Telecopier: (302) 634-1872
                                          Telex: 177425 MBDEL UT
                                          Email: baiz_nancy@jpmorgan.com
<PAGE>   50
                                                                              46


                                    DEUTSCHE BANK AG, NEW YORK AND/OR
                                    CAYMAN ISLANDS BRANCHES,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________


                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    CITIBANK, N.A.,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    BANK ONE, NA (MAIN OFFICE CHICAGO),

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    FIRST UNION NATIONAL BANK,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________
<PAGE>   51
                                                                              47


                                    FLEET NATIONAL BANK,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    CREDIT SUISSE FIRST BOSTON,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    WACHOVIA BANK, NA,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    STATE STREET BANK AND TRUST COMPANY,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    THE BANK OF TOKYO-MITSUBISHI
                                    TRUST COMPANY,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________

                                    THE BANK OF NEW YORK,

                                    by    _____________________________________
                                          Name: _______________________________
                                          Title: ______________________________