Document:

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                             STOCK OPTION AGREEMENT

         STOCK OPTION AGREEMENT, dated as of January 26, 2000, between GBT
BANCORP, a Massachusetts corporation ("ISSUER"), and ANDOVER BANCORP, INC., a
Delaware corporation ("GRANTEE").

                                   WITNESSETH:

         WHEREAS, Grantee and Issuer have entered into an Agreement and Plan of
Merger of even date herewith (the "MERGER AGREEMENT"), which agreement has been
executed by the parties hereto immediately prior to this Agreement; and

         WHEREAS, as a condition to Grantee's entering into the Merger Agreement
and in consideration therefor, Issuer has agreed to grant Grantee the Option (as
hereinafter defined):

         NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements set forth herein and in the Merger Agreement, the
parties hereto agree as follows:

         1. (a) Issuer hereby grants to Grantee an unconditional, irrevocable
option (the "OPTION") to purchase, subject to the terms hereof, up to 157,483
fully paid and nonassessable shares of Issuer's Common Stock, no par value per
share ("COMMON STOCK"), at a price of $20.50 per share (the "OPTION PRICE");
PROVIDED FURTHER that in no event shall the number of shares of Common Stock for
which this Option is exercisable exceed 19.9% of the Issuer's issued and
outstanding shares of Common Stock without giving effect to any shares subject
to or issued pursuant to the Option. The number of shares of Common Stock that
may be received upon the exercise of the Option and the Option Price are subject
to adjustment as herein set forth.

            (b) In the event that any additional shares of Common Stock are
issued or otherwise become outstanding after the date of this Agreement (other
than pursuant to this Agreement), the number of shares of Common Stock subject
to the Option shall be increased so that, after such issuance, it equals 19.9%
of the number of shares of Common Stock then issued and outstanding without
giving effect to any shares subject or issued pursuant to the Option. Nothing
contained in this Section 1(b) or elsewhere in this Agreement shall be deemed to
authorize Issuer or Grantee to breach any provision of the Merger Agreement.

         2. (a) The Holder (as hereinafter defined) may exercise the Option, in
whole or part, and from time to time, if, but only if, both an Initial
Triggering Event (as hereinafter defined) and a Subsequent Triggering Event (as
hereinafter defined) shall have occurred prior to the occurrence of an Exercise
Termination Event (as hereinafter defined); PROVIDED THAT the Holder shall have
sent the written notice of such exercise (as provided in subsection (e) of this
Section 2) within 100 days following such Subsequent Triggering Event. Each of
the following shall be an "Exercise Termination Event": (i) the Effective Time
(as defined in the Merger Agreement) of the Merger; (ii) termination of the
Merger Agreement in accordance with the provisions thereof if such termination
occurs prior to the occurrence of an Initial

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Triggering Event except a termination by Grantee pursuant to Sections 8.01(d) or
8.01(e) of the Merger Agreement (unless the breach by Issuer giving rise to such
right of termination is non-volitional); or (iii) the passage of twelve months
after termination of the Merger Agreement if such termination follows the
occurrence of an Initial Triggering Event or is a termination by Grantee
pursuant to Sections 8.01(d) or 8.01(e) of the Merger Agreement (unless the
breach by Issuer giving rise to such right of termination is non-volitional).
The "Last Triggering Event" shall mean the last Initial Triggering Event to
expire. The term "Holder" shall mean the holder or holders of the Option.

            (b) The term "Initial Triggering Event" shall mean any of the
following events or transactions occurring after the date hereof:

                (i) Issuer or any of its Subsidiaries (each an "ISSUER
SUBSIDIARY"), without having received Grantee's prior written consent, shall
have entered into an agreement to engage in an Acquisition Transaction (as
hereinafter defined) with any person (the term "person" for purposes of this
Agreement having the meaning assigned thereto in Sections 3(a)(9) and 13(d)(3)
of the Securities Exchange Act of 1934, as amended (the "1934 ACT"), and the
rules and regulations thereunder) other than Grantee or any of its Subsidiaries
(each a "GRANTEE SUBSIDIARY") or the Board of Directors of Issuer shall have
recommended that the stockholders of Issuer approve or accept any Acquisition
Transaction or shall have failed to publicly oppose an Acquisition Transaction,
in each case with any person other than Grantee or a Grantee Subsidiary. For
purposes of this Agreement, "Acquisition Transaction" shall mean (w) a merger or
consolidation, or any similar transaction, involving Issuer or any Significant
Subsidiary (as defined in Rule 1-02 of Regulation S-X promulgated by the
Securities and Exchange Commission (the "SEC") of Issuer, (x) a purchase, lease
or other acquisition of all or a substantial portion of the assets of Issuer or
any Significant Subsidiary of Issuer, (y) a purchase or other acquisition
(including by way of merger, consolidation, share exchange or otherwise) of
securities representing 10% or more of the voting power of Issuer or any
Significant Subsidiary of Issuer, or (z) any substantially similar transaction;
PROVIDED, HOWEVER, that in no event shall any (i) merger, consolidation, or
similar transaction involving Issuer or any Significant Subsidiary in which the
voting securities of Issuer outstanding immediately prior thereto continue to
represent (by either remaining outstanding or being converted into the voting
securities of the surviving entity of any such transaction) at least 65% of the
combined voting power of the voting securities of the Issuer or the surviving
entity outstanding immediately after the consummation of such merger,
consolidation, or similar transaction, or (ii) any merger, consolidation,
purchase or similar transaction involving only the Issuer and one or more of its
Subsidiaries or involving only any two or more of such Subsidiaries, be deemed
to be an Acquisition Transaction, PROVIDED any such transaction is not entered
into in violation of the terms of the Merger Agreement;

                (ii) Issuer or any Issuer Subsidiary, without having received
Grantee's prior written consent, shall have authorized, recommended, proposed or
publicly

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announced its intention to authorize, recommend or propose, to engage in an
Acquisition Transaction with any person other than Grantee or a Grantee
Subsidiary, or the Board of Directors of Issuer shall have publicly withdrawn or
modified, or publicly announced its intention to withdraw or modify, in any
manner adverse to Grantee, its recommendation that the stockholders of Issuer
approve the transactions contemplated by the Merger Agreement;

                (iii) The shareholders of Issuer shall have voted and failed to
approve and adopt the Merger Agreement and the Merger at a meeting which has
been held for that purpose or any adjournment or postponement thereof, or such
meeting shall not have been held in violation of the Merger Agreement or shall
have been canceled prior to termination of the Merger Agreement if, prior to
such meeting (or if such meeting shall not have been held or shall have been
canceled, prior to such termination), any person (other than the Grantee or a
Grantee Subsidiary) shall have made a proposal to Issuer or its stockholders by
public announcement or written communication that is or becomes the subject of
public disclosure to engage in an Acquisition Transaction;

                (iv) Any person other than Grantee, any Grantee Subsidiary or
any Issuer Subsidiary acting in a fiduciary capacity in the ordinary course of
its business shall have acquired beneficial ownership or the right to acquire
beneficial ownership of 10% or more of the outstanding shares of Common Stock
(the term "beneficial ownership" for purposes of this Option Agreement having
the meaning assigned thereto in Section 13(d) of the 1934 Act, and the rules and
regulations thereunder);

                (v) Any person other than Grantee or any Grantee Subsidiary
shall have made a bona fide proposal to Issuer or its stockholders by public
announcement or written communication that is or becomes the subject of public
disclosure to engage in an Acquisition Transaction;

                (vi) After an overture is made by a person other than Grantee or
any Grantee Subsidiary to Issuer or its stockholders to engage in an Acquisition
Transaction, Issuer shall have breached any covenant or obligation contained in
the Merger Agreement and such breach (x) would entitle Grantee to terminate the
Merger Agreement and (y) shall not have been cured prior to the Notice Date (as
defined below); or

                (vii) Any person other than Grantee or any Grantee Subsidiary,
other than in connection with a transaction to which Grantee has given its prior
written consent, shall have filed an application or notice with the Federal
Reserve Board, or other federal or state bank regulatory authority, whether in
draft or final form, for approval to engage in an Acquisition Transaction.

            (c) The term "Subsequent Triggering Event" shall mean either of the
following events or transactions occurring after the date hereof:

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                (i) The acquisition by any person of beneficial ownership of 20%
or more of the then outstanding Common Stock; or

                (ii) The occurrence of the Initial Triggering Event described in
clause (i) of subsection (b) of this Section 2, except that the percentage
referred to in clause (y) shall be 20%.

            (d) Issuer shall notify Grantee promptly in writing of the
occurrence of any Initial Triggering Event or Subsequent Triggering Event
(together, a "TRIGGERING EVENT"), it being understood that the giving of such
notice by Issuer shall not be a condition to the right of the Holder to exercise
the Option.

            (e) In the event the Holder is entitled to and wishes to exercise
the Option, it shall send to Issuer a written notice (the date of which being
herein referred to as the "NOTICE DATE") specifying (i) the total number of
shares it will purchase pursuant to such exercise and (ii) a place and date not
earlier than three business days nor later than 60 business days from the Notice
Date for the closing of such purchase (the "CLOSING DATE"); PROVIDED that if
prior notification to or approval of the Federal Reserve Board or any other
regulatory agency is required in connection with such purchase, the Holder shall
promptly file the required notice or application for approval and shall
expeditiously process the same and the period of time that otherwise would run
pursuant to this sentence shall run instead from the date on which any required
notification periods (including any extensions thereof) have expired or been
terminated or such approvals have been obtained and any requisite waiting period
or periods (including any extensions thereof) shall have passed. Any exercise of
the Option shall be deemed to occur on the Notice Date relating thereto.

            (f) At the closing referred to in subsection (e) of this Section 2,
the Holder shall pay to Issuer the aggregate purchase price for the shares of
Common Stock purchased pursuant to the exercise of the Option in immediately
available funds by wire transfer to a bank account designated by Issuer,
PROVIDED that failure or refusal of Issuer to designate such a bank account
shall not preclude the Holder from exercising the Option.

            (g) At such closing, simultaneously with the delivery of immediately
available funds as provided in subsection (f) of this Section 2, Issuer shall
deliver to the Holder a certificate or certificates representing the number of
shares of Common Stock purchased by the Holder and, if the Option should be
exercised in part only, a new Option evidencing the rights of the Holder thereof
to purchase the balance of the shares purchasable hereunder, and the Holder
shall deliver to Issuer a copy of this Agreement and a letter agreeing that the
Holder will not offer to sell or otherwise dispose of such shares in violation
of applicable law or the provisions of this Agreement.

            (h) Certificates for Common Stock delivered at a closing hereunder
may be endorsed with a restrictive legend that shall read substantially as
follows:

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         "The transfer of the shares represented by this certificate is subject
         to certain provisions of an agreement between the registered holder
         hereof and Issuer and to resale restrictions arising under the
         Securities Act of 1933, as amended. A copy of such agreement is on file
         at the principal office of Issuer and will be provided to the holder
         hereof without charge upon receipt by Issuer of a written request
         therefor."

It is understood and agreed that: (i) the reference to the resale restrictions
of the Securities Act of 1933, as amended (the "1933 ACT"), in the above legend
shall be removed by delivery of substitute certificate(s) without such reference
if the Holder shall have delivered to Issuer a copy of a letter from the staff
of the SEC, or an opinion of counsel, in form and substance reasonably
satisfactory to Issuer, to the effect that such legend is not required for
purposes of the 1933 Act; (ii) the reference to the provisions to this Agreement
in the above legend shall be removed by delivery of substitute certificate(s)
without such reference if the shares have been sold or transferred in compliance
with the provisions of this Agreement and under circumstances that do not
require the retention of such reference; and (iii) the legend shall be removed
in its entirety if the conditions in the preceding clauses (i) and (ii) are both
satisfied. In addition, such certificates shall bear any other legend as may be
required by law.

                (i) Upon the giving by the Holder to Issuer of the written
notice of exercise of the Option provided for under subsection (e) of this
Section 2 and the tender of the applicable purchase price in immediately
available funds, the Holder shall be deemed to be the holder of record of the
shares of Common Stock issuable upon such exercise, notwithstanding that the
stock transfer books of Issuer shall then be closed or that certificates
representing such shares of Common Stock shall not then be actually delivered to
the Holder. Issuer shall pay all expenses, and any and all United States
federal, state and local taxes and other charges that may be payable in
connection with the preparation, issue and delivery of stock certificates under
this Section 2 in the name of the Holder or its assignee, transferee or
designee.

         3. Issuer agrees: (i) that it shall at all times maintain, free from
preemptive rights, sufficient authorized but unissued or treasury shares of
Common Stock so that the Option may be exercised without additional
authorization of Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Common Stock; (ii)
that it will not, by charter amendment or through reorganization, consolidation,
merger, dissolution or sale of assets, or by any other voluntary act, avoid or
seek to avoid the observance or performance of any of the covenants,
stipulations or conditions to be observed or performed hereunder by Issuer;
(iii) promptly to take all action as may from time to time be required
(including (x) complying with all premerger notification, reporting and waiting
period requirements specified in 15 U.S.C. sec. 18a and regulations promulgated
thereunder and (y) in the event, under the Bank Holding Company Act of 1956, as
amended (the "BHCA"), or the Change in Bank Control Act of 1978, as amended, or
any state banking law, prior approval of or notice to the Federal Reserve Board
or to any other federal or state regulatory authority

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is necessary before the Option may be exercised, cooperating fully with the
Holder in preparing such applications or notices and providing such information
to the Federal Reserve Board or such other federal or state regulatory authority
as they may require) in order to permit the Holder to exercise the Option and
Issuer duly and effectively to issue shares of Common Stock pursuant hereto; and
(iv) promptly to take all action provided herein to protect the rights of the
Holder against dilution.

         4. This Agreement (and the Option granted hereby) are exchangeable,
without expense, at the option of the Holder, upon presentation and surrender of
this Agreement at the principal office of Issuer, for other Agreements providing
for Options of different denominations entitling the holder thereof to purchase,
on the same terms and subject to the same conditions as are set forth herein, in
the aggregate the same number of shares of Common Stock purchasable hereunder.
The terms "Agreement" and "Option" as used herein include any Stock Option
Agreements and related Options for which this Agreement (and the Option granted
hereby) may be exchanged. Upon receipt by Issuer of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this
Agreement, and (in the case of loss, theft or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancellation of this
Agreement, if mutilated, Issuer will execute and deliver a new Agreement of like
tenor and date. Any such new Agreement executed and delivered shall constitute
an additional contractual obligation on the part of Issuer, whether or not the
Agreement so lost, stolen, destroyed or mutilated shall at any time be
enforceable by anyone.

         5. In addition to the adjustment in the number of shares of Common
Stock that are purchasable upon exercise of the Option pursuant to Section 1 of
this Agreement, the number of shares of Common Stock purchasable upon the
exercise of the Option and the Option Price shall be subject to adjustment from
time to time as provided in this Section 5. In the event of any change in, or
distributions in respect of, the Common Stock by reason of stock dividends,
split-ups, mergers, recapitalizations, combinations, subdivisions, conversions,
exchanges of shares, distributions on or in respect of the Common Stock that
would be prohibited under the terms of the Merger Agreement, or the like, the
type and number of shares of Common Stock purchasable upon exercise hereof and
the Option Price shall be appropriately adjusted in such manner as shall fully
preserve the economic benefits provided hereunder and proper provision shall be
made in any agreement governing any such transaction to provide for such proper
adjustment and the full satisfaction of the Issuer's obligations hereunder.

         6. The obligations set forth in this Section 6 shall apply during such
time as securities of the Issuer (or its successors or assigns) are registered
under the 1934 Act. Upon the occurrence of a Subsequent Triggering Event that
occurs prior to an Exercise Termination Event, Issuer shall, at the request of
Grantee delivered within 100 day after such Subsequent Triggering Event (whether
on its own behalf or on behalf of any subsequent holder of this Option (or part
thereof) or any of the shares of Common Stock issued pursuant hereto), promptly
prepare, file and keep current a shelf registration statement under the 1933 Act

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covering the resale of this Option and any shares issued pursuant to this Option
and the issuance of any shares issuable pursuant to this Option to the extent
then permitted under the rules, regulations or policies of the SEC and, to the
extent not so permitted, the resale of such shares issuable pursuant to this
Option. The Issuer shall use its reasonable best efforts to cause such
registration statement to become effective and remain current in order to permit
the sale or other disposition of this Option and any shares of Common Stock
issued upon total or partial exercise of this Option ("OPTION SHARES") in
accordance with any plan of disposition requested by Grantee. Issuer will use
its reasonable best efforts to cause such registration statement first to become
effective and then to remain effective for such period not in excess of 180 days
from the day such registration statement first becomes effective or such longer
time as may be reasonably necessary to effect such sales or other dispositions.
Grantee shall have the right to demand two such registrations. The foregoing
notwithstanding, if, at the time of any request by Grantee for registration of
the Option or Option Shares as provided above, Issuer is in registration with
respect to an underwritten public offering of shares of Common Stock, and if in
the good faith judgment of the managing underwriter or managing underwriters,
or, if none, the sole underwriter or underwriters, of such offering, the
inclusion of the Holder's Option or Option Shares would interfere with the
successful marketing of the shares of Common Stock offered by Issuer, the number
of Option Shares otherwise to be covered in the registration statement
contemplated hereby may be reduced; and PROVIDED, HOWEVER, that after any such
required reduction the number of Option Shares to be included in such offering
for the account of the Holder shall constitute at least 25% of the total number
of shares to be sold by the Holder and Issuer in the aggregate; and PROVIDED
FURTHER, however, that if such reduction occurs, then the Issuer shall file a
registration statement for the balance as promptly as practical and no reduction
shall thereafter occur. Each such Holder shall provide all information
reasonably requested by Issuer for inclusion in any registration statement to be
filed hereunder. If requested by any such Holder in connection with such
registration, Issuer shall become a party to any underwriting agreement relating
to the sale of such shares, but only to the extent of obligating itself in
respect of representations, warranties, indemnities and other agreements
customarily included in such underwriting agreements for the Issuer. Upon
receiving any request under this Section 6 from any Holder, Issuer agrees to
send a copy thereof to any other person known to Issuer to be entitled to
registration rights under this Section 6, in each case by promptly mailing the
same, postage prepaid, to the address of record of the persons entitled to
receive such copies. Notwithstanding anything to the contrary contained herein,
in no event shall Issuer be obligated to effect more than two registrations
pursuant to this Section 6 by reason of the fact that there shall be more than
one Grantee as a result of any assignment or division of this Agreement.

         7. (a) Immediately prior to the occurrence of a Repurchase Event (as
defined below), (i) following a request of the Holder, delivered prior to an
Exercise Termination Event, Issuer (or any successor thereto) shall repurchase
the Option from the Holder at a price (the "OPTION REPURCHASE PRICE") equal to
the amount by which (A) the market/offer price (as defined below) exceeds (B)
the Option Price, multiplied by the number of shares for which this Option may
then be exercised and (ii) at the request of the owner of Option Shares from

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time to time (the "OWNER") delivered within 100 days after such occurrence (or
such later period as provided in Section 10), Issuer shall repurchase such
number of the Option Shares from the Owner as the Owner shall designate at a
price (the "OPTION SHARE REPURCHASE PRICE") equal to the market/offer price
multiplied by the number of Option Shares so designated. The term "market/offer
price" shall mean the highest of (i) the price per share of Common Stock at
which a tender offer or exchange offer therefor has been made, (ii) the price
per share of Common Stock to be paid by any third party pursuant to an agreement
with Issuer, (iii) the highest closing price for shares of Common Stock within
the six-month period immediately preceding the date the Holder gives notice of
the required repurchase of this Option or the Owner gives notice of the required
repurchase of Option Shares, as the case may be, or (iv) in the event of a sale
of all or a substantial portion of Issuer's assets, the sum of the price paid in
such sale for such assets and the current market value of the remaining assets
of Issuer as determined by a nationally recognized investment banking firm
selected by the Holder or the Owner, as the case may be, divided by the number
of shares of Common Stock of Issuer outstanding at the time of such sale. In
determining the market/offer price, the value of consideration other than cash
shall be determined by a nationally recognized investment banking firm selected
by the Holder or Owner, as the case may be, and reasonably acceptable to the
Issuer.

            (b) The Holder and the Owner, as the case may be, may exercise its
right to require Issuer to repurchase the Option and any Option Shares pursuant
to this Section 7 by surrendering for such purpose to Issuer, at its principal
office, a copy of this Agreement or certificates for Option Shares, as
applicable, accompanied by a written notice or notices stating that the Holder
or the Owner, as the case may be, elects to require Issuer to repurchase this
Option and/or the Option Shares in accordance with the provisions of this
Section 7. Within the later to occur of (x) five business days after the
surrender of the Option and/or certificates representing Option Shares and the
receipt of such notice or notices relating thereto and (y) the time that is
immediately prior to the occurrence of a Repurchase Event, Issuer shall deliver
or cause to be delivered to the Holder the Option Repurchase Price and/or to the
Owner the Option Share Repurchase Price therefor or the portion thereof that
Issuer is not then prohibited under applicable law and regulation from so
delivering.

            (c) To the extent that Issuer is prohibited under applicable law or
regulation from repurchasing the Option and/or the Option Shares in full, Issuer
shall immediately so notify the Holder and/or the Owner and thereafter deliver
or cause to be delivered, from time to time, to the Holder and/or the Owner, as
appropriate, the portion of the Option Repurchase Price and the Option Share
Repurchase Price, respectively, that it is no longer prohibited from delivering,
within five business days after the date on which Issuer is no longer so
prohibited; PROVIDED, HOWEVER, that if Issuer at any time after delivery of a
notice of repurchase pursuant to paragraph (b) of this Section 7 is prohibited
under applicable law or regulation from delivering to the Holder and/or the
Owner, as appropriate, the Option Repurchase Price and the Option Share
Repurchase Price, respectively, in full (and Issuer hereby undertakes to use its
best efforts to obtain all required regulatory and legal approvals and to file
any required

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notices as promptly as practicable in order to accomplish such repurchase), the
Holder or Owner may revoke its notice of repurchase of the Option or the Option
Shares either in whole or to the extent of the prohibition, whereupon, in the
latter case, Issuer shall promptly (i) deliver to the Holder and/or the Owner,
as appropriate, that portion of the Option Repurchase Price or the Option Share
Repurchase Price that Issuer is not prohibited from delivering; and (ii)
deliver, as appropriate, either (A) to the Holder, a new Stock Option Agreement
evidencing the right of the Holder to purchase that number of shares of Common
Stock obtained by multiplying the number of shares of Common Stock for which the
surrendered Stock Option Agreement was exercisable at the time of delivery of
the notice of repurchase by a fraction, the numerator of which is the Option
Repurchase Price less the portion thereof theretofore delivered to the Holder
and the denominator of which is the Option Repurchase Price, or (B) to the Owner
a certificate for the Option Shares it is then so prohibited from repurchasing.

            (d) For purposes of this Section 7, a Repurchase Event shall be
deemed to have occurred (i) upon the consummation of any merger, consolidation
or similar transaction involving Issuer or any purchase, lease or other
acquisition of all or a substantial portion of the assets of Issuer, other than
any such transaction which would not constitute an Acquisition Transaction
pursuant to the proviso to Section 2 (b) (i) hereof or (ii) upon the acquisition
by any person of beneficial ownership of 50% or more of the then outstanding
shares of Common Stock, PROVIDED THAT no such event shall constitute a
Repurchase Event unless a Subsequent Triggering Event shall have occurred prior
to an Exercise Termination Event. The parties hereto agree that Issuer's
obligations to repurchase the Option or Option Shares under this Section 7 shall
not terminate upon the occurrence of an Exercise Termination Event unless no
Subsequent Triggering Event shall have occurred prior to the occurrence of an
Exercise Termination Event.

         8. (a) In the event that prior to an Exercise Termination Event, Issuer
shall enter into an agreement (i) to consolidate with or merge into any person,
other than Grantee or one of its Subsidiaries, and shall not be the continuing
or surviving corporation of such consolidation or merger, (ii) to permit any
person, other than Grantee or one of its Subsidiaries, to merge into Issuer and
Issuer shall be the continuing or surviving corporation, but, in connection with
such merger, the then outstanding shares of Common Stock shall be changed into
or exchanged for stock or other securities of any other person or cash or any
other property or the then outstanding shares of Common Stock shall after such
merger represent less than 50% of the outstanding voting shares and voting share
equivalents of the merged company, or (iii) to sell or otherwise transfer all or
substantially all of its assets to any person, other than Grantee or one of its
Subsidiaries, then, and in each such case, the agreement governing such
transaction shall make proper provision so that the Option shall, upon the
consummation of any such transaction and upon the terms and conditions set forth
herein, be converted into, or exchanged for, an option (the "SUBSTITUTE
OPTION"), at the election of the Holder, of either (x) the Acquiring Corporation
(as hereinafter defined) or (y) any person that controls the Acquiring
Corporation.

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            (b) The following terms have the meanings indicated:

                (1) "Acquiring Corporation" shall mean (i) the continuing or
surviving corporation of a consolidation or merger with Issuer (if other than
Issuer), (ii) Issuer in a merger in which Issuer is the continuing or surviving
person, and (iii) the transferee of all or substantially all of Issuer's assets.

                (2) "Substitute Common Stock" shall mean the common stock issued
by the issuer of the Substitute Option upon exercise of the Substitute Option.

                (3) "Assigned Value" shall mean the market/offer price, as
defined in Section 7.

                (4) "Average Price" shall mean the average closing price of a
share of the Substitute Common Stock for the one year immediately preceding the
consolidation, merger or sale in question, but in no event higher than the
closing price of the shares of Substitute Common Stock on the day preceding such
consolidation, merger or sale; PROVIDED THAT if Issuer is the issuer of the
Substitute Option, the Average Price shall be computed with respect to a share
of common stock issued by the person merging into Issuer or by any company which
controls or is controlled by such person, as the Holder may elect.

            (c) The Substitute Option shall have the same terms as the Option,
provided, that if the terms of the Substitute Option cannot, for legal reasons,
be the same as the Option, such terms shall be as similar as possible and in no
event less advantageous to the Holder. The issuer of the Substitute Option shall
also enter into an agreement with the then Holder or Holders of the Substitute
Option in substantially the same form as this Agreement, which shall be
applicable to the Substitute Option.

                  (d) The Substitute Option shall be exercisable for such number
of shares of Substitute Common Stock as is equal to the Assigned Value
multiplied by the number of shares of Common Stock for which the Option is then
exercisable, divided by the Average Price. The exercise price of the Substitute
Option per share of Substitute Common Stock shall then be equal to the Option
Price multiplied by a fraction, the numerator of which shall be the number of
shares of Common Stock for which the Option is then exercisable and the
denominator of which shall be the number of shares of Substitute Common Stock
for which the Substitute Option is exercisable.

                  (e) In no event, pursuant to any of the foregoing paragraphs,
shall the Substitute Option be exercisable for more than 19.9% of the shares of
Substitute Common Stock outstanding prior to exercise of the Substitute Option.
In the event that the Substitute Option would be exercisable for more than 19.9%
of the shares of Substitute Common Stock outstanding prior to exercise but for
this clause (e), the issuer of the Substitute Option (the "SUBSTITUTE OPTION
ISSUER") shall make a cash payment to Holder equal to the excess of (i) the

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value of the Substitute Option without giving effect to the limitation in this
clause (e) over (ii) the value of the Substitute Option after giving effect to
the limitation in this clause (e). This difference in value shall be determined
by a nationally recognized investment banking firm selected by the Holder or the
Owner, as the case may be, and reasonably acceptable to the Acquiring
Corporation.

            (f) Issuer shall not enter into any transaction described in
subsection (a) of this Section 8 unless the Acquiring Corporation and any person
that controls the Acquiring Corporation assume in writing all the obligations of
Issuer hereunder.

         9. (a) At the request of the holder of the Substitute Option (the
"SUBSTITUTE OPTION HOLDER"), the issuer of the Substitute Option (the
"SUBSTITUTE OPTION ISSUER") shall repurchase the Substitute Option from the
Substitute Option Holder at a price (the "SUBSTITUTE OPTION REPURCHASE PRICE")
equal to (x) the amount by which (i) the Highest Closing Price (as hereinafter
defined) exceeds (ii) the exercise price of the Substitute Option, multiplied by
the number of shares of Substitute Common Stock for which the Substitute Option
may then be exercised plus (y) Grantee's Out-of-Pocket Expenses (to the extent
not previously reimbursed), and at the request of the owner (the "SUBSTITUTE
SHARE OWNER") of shares of Substitute Common Stock (the "SUBSTITUTE SHARES"),
the Substitute Option Issuer shall repurchase the Substitute Shares at a price
(the "SUBSTITUTE SHARE REPURCHASE PRICE") equal to (x) the Highest Closing Price
multiplied by the number of Substitute Shares so designated plus (y) Grantee's
Out-of-Pocket Expenses (to the extent not previously reimbursed). The term
"Highest Closing Price" shall mean the highest closing price for shares of
Substitute Common Stock within the six-month period immediately preceding the
date the Substitute Option Holder gives notice of the required repurchase of the
Substitute Option or the Substitute Share Owner gives notice of the required
repurchase of the Substitute Shares, as applicable.

            (b) The Substitute Option Holder and the Substitute Share Owner, as
the case may be, may exercise its respective right to require the Substitute
Option Issuer to repurchase the Substitute Option and the Substitute Shares
pursuant to this Section 9 by surrendering for such purpose to the Substitute
Option Issuer, at its principal office, the agreement for such Substitute Option
(or, in the absence of such an agreement, a copy of this Agreement) and
certificates for Substitute Shares accompanied by a written notice or notices
stating that the Substitute Option Holder or the Substitute Share Owner, as the
case may be, elects to require the Substitute Option Issuer to repurchase the
Substitute Option and/or the Substitute Shares in accordance with the provisions
of this Section 9. As promptly as practicable, and in any event within five
business days after the surrender of the Substitute Option and/or certificates
representing Substitute Shares and the receipt of such notice or notices
relating thereto, the Substitute Option Issuer shall deliver or cause to be
delivered to the Substitute Option Holder the Substitute Option Repurchase Price
and/or to the Substitute Share Owner the Substitute Share Repurchase Price
therefor or the portion thereof which the Substitute Option Issuer is not then
prohibited under applicable law and regulation from so delivering.

                                       11
<PAGE>   12

            (c) To the extent that the Substitute Option Issuer is prohibited
under applicable law or regulation from repurchasing the Substitute Option
and/or the Substitute Shares in part or in full, the Substitute Option Issuer
shall immediately so notify the Substitute Option Holder and/or the Substitute
Share Owner and thereafter deliver or cause to be delivered, from time to time,
to the Substitute Option Holder and/or the Substitute Share Owner, as
appropriate, the portion of the Substitute Share Repurchase Price, respectively,
which it is no longer prohibited from delivering, within five business days
after the date on which the Substitute Option Issuer is no longer so prohibited;
PROVIDED, HOWEVER, that if the Substitute Option Issuer is at any time after
delivery of a notice of repurchase pursuant to subsection (b) of this Section 9
prohibited under applicable law or regulation from delivering to the Substitute
Option Holder and/or the Substitute Share Owner, as appropriate, the Substitute
Option Repurchase Price and the Substitute Share Repurchase Price, respectively,
in full (and the Substitute Option Issuer shall use its best efforts to receive
all required regulatory and legal approvals as promptly as practicable in order
to accomplish such repurchase), the Substitute Option Holder or Substitute Share
Owner may revoke its notice of repurchase of the Substitute Option or the
Substitute Shares either in whole or to the extent of the prohibition,
whereupon, in the latter case, the Substitute Option Issuer shall promptly (i)
deliver to the Substitute Option Holder or Substitute Share Owner, as
appropriate, that portion of the Substitute Option Repurchase Price or the
Substitute Share Repurchase Price that the Substitute Option Issuer is not
prohibited from delivering; and (ii) deliver, as appropriate, either (A) to the
Substitute Option Holder, a new Substitute Option evidencing the right of the
Substitute Option Holder to purchase that number of shares of the Substitute
Common Stock obtained by multiplying the number of shares of the Substitute
Common Stock for which the surrendered Substitute Option was exercisable at the
time of delivery of the notice of repurchase by a fraction, the numerator of
which is the Substitute Option Repurchase Price less the portion thereof
theretofore delivered to the Substitute Option Holder and the denominator of
which is the Substitute Option Repurchase Price, or (B) to the Substitute Share
Owner, a certificate for the Substitute Option Shares it is then so prohibited
from repurchasing.

         10. The 100-day period for exercise of certain rights under Sections 2,
6, 7 and 13 shall be extended: (i) to the extent necessary to obtain all
regulatory approvals for the exercise of such rights, and for the expiration of
all statutory waiting periods; and (ii) to the extent necessary to avoid
liability under Section 16(b) of the 1934 Act by reason of such exercise.

         11. Issuer hereby represents and warrants to Grantee as follows:

            (a) Issuer has full corporate power and authority to execute and
deliver this Agreement and to consummate the transactions contemplated hereby.
The execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly and validly authorized by the
Board of Directors of Issuer and no other corporate proceedings on the part of
Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated. This Agreement has been duly and validly

                                       12
<PAGE>   13

executed and delivered by Issuer.

            (b) Issuer has taken all necessary corporate action to authorize and
reserve and to permit it to issue, and at all times from the date hereof through
the termination of this Agreement in accordance with its terms will have
reserved for issuance upon the exercise of the Option, that number of shares of
Common Stock equal to the maximum number of shares of Common Stock at any time
and from time to time issuable hereunder, and all such shares, upon issuance
pursuant hereto, will be duly authorized, validly issued, fully paid,
nonassessable, and will be delivered free and clear of all claims, liens,
encumbrance and security interests and not subject to any preemptive rights.

            (c) Issuer has taken all action (including if required redeeming all
of the Rights or amending or terminating the Rights Agreement) so that the
entering into of this Option Agreement, the acquisition of shares of Common
Stock hereunder and the other transactions contemplated hereby do not and will
not result in the grant of any rights to any person under the Rights Agreement
or enable or require the Rights to be exercised, distributed or triggered.

         12. Grantee hereby represents and warrants to Issuer that:

            (a) Grantee has all requisite corporate power and authority to enter
into this Agreement and, subject to any approvals or consents referred to
herein, to consummate the transactions contemplated hereby. The execution and
delivery of this Agreement and the consummation of the transactions contemplated
hereby have been duly authorized by all necessary corporate action on the part
of Grantee. This Agreement has been duly executed and delivered by Grantee.

            (b) The Option is not being, and any shares of Common Stock or other
securities acquired by Grantee upon exercise of the Option will not be, acquired
with a view to the public distribution thereof and will not be transferred or
otherwise disposed of except in a transaction registered or exempt from
registration under the Securities Act.

         13. Neither of the parties hereto may assign any of its rights or
obligations under this Option Agreement or the Option created hereunder to any
other person, without the express written consent of the other party, except
that in the event a Subsequent Triggering Event shall have occurred prior to an
Exercise Termination Event, Grantee, subject to the express provisions hereof,
may assign in whole or in part its rights and obligations hereunder within 90
days following such Subsequent Triggering Event (or such later period as
provided in Section 10); PROVIDED, HOWEVER, that until the date 15 days
following the date on which the Federal Reserve Board approves an application by
Grantee under the BHCA to acquire the shares of Common Stock subject to the
Option, Grantee may not assign its rights under the Option except in (i) a
widely dispersed public distribution, (ii) a private placement in which no one
party acquires the right to purchase in excess of 2% of the voting shares of
Issuer, (iii)

                                       13
<PAGE>   14

an assignment to a single party (e.g., a broker or investment banker) for the
purpose of conducting a widely dispersed public distribution on Grantee's
behalf, or (iv) any other manner approved by the Federal Reserve Board.

         14. Each of Grantee and Issuer will use its best efforts to make all
filings with, and to obtain consents of, all third parties and governmental
authorities necessary to the consummation of the transactions contemplated by
this Agreement, including without limitation making application to list the
shares of Common Stock issuable hereunder on the Nasdaq National Stock Market
upon official notice of issuance and applying to the Federal Reserve Board under
the BHCA for approval to acquire the shares issuable hereunder, but Grantee
shall not be obligated to apply to state banking authorities for approval to
acquire the shares of Common Stock issuable hereunder until such time, if ever,
as it deems appropriate to do so.

         15. (a) Grantee may, at any time during which Issuer would be required
to repurchase the Option or any Option Shares pursuant to Section 7, surrender
the Option (together with any Option Shares issued to and then owned by Grantee)
to Issuer in exchange for a cash fee equal to the Surrender Price (as defined
below); provided, however, that Grantee may not exercise its rights pursuant to
this Section 15 if Issuer has repurchased the Option (or any portion thereof) or
any Option Shares pursuant to Section 7. The "Surrender Price" shall be equal to
(i) $1 million, plus (ii) if applicable, the aggregate purchase price previously
paid pursuant hereto by Grantee with respect to any Option Shares, minus (iii)
if applicable, the sum of (A) the excess of (1) the net cash amounts, if any,
received by Grantee pursuant to the arms' length sale of Option Shares (or any
other securities into which such Option Shares were converted or exchanged) to
any party not affiliated with Grantee, over (2) the aggregate purchase price
previously paid pursuant hereto by Grantee with respect to such Option Shares
and (B) the net cash amounts, if any, received by Grantee pursuant to an arms'
length sale of a portion of the Option to any party not affiliated with Grantee.

            (b) Grantee may exercise its right to surrender the Option and any
Option Shares pursuant to this Section 15 by surrendering to Issuer, at its
principal office, this Agreement together with certificates for Option Shares,
if any, accompanied by a written notice stating (i) that Grantee elects to
surrender the Option and Option Shares, if any, in accordance with the
provisions of this Section 15 and (ii) the Surrender Price. The Surrender Price
shall be payable in immediately available funds on or before the second business
day following receipt of such notice by Issuer.

            (c) To the extent that Issuer is prohibited under applicable law or
regulation from paying the Surrender Price to Grantee in full, Issuer shall
immediately so notify Grantee and thereafter deliver or cause to be delivered,
from time to time, to Grantee, the portion of the Surrender Price that Issuer is
no longer prohibited from paying, within five business days after the date on
which Issuer is no longer so prohibited, PROVIDED, HOWEVER, that if Issuer at
any time after delivery of a notice of surrender pursuant to paragraph (b) of
this Section 15 is

                                       14
<PAGE>   15

prohibited under applicable law or regulation from paying to Grantee the
Surrender Price in full (i) Issuer shall (A) use its reasonable best efforts to
obtain all required regulatory and legal approvals and to file any required
notices as promptly as practicable in order to make such payments, (B) within
five days of the submission or receipt of any documents relating to any such
regulatory and legal approvals, provide Grantee with copies of the same, and (C)
keep Grantee advised of both the status of any such request for regulatory and
legal approvals, as well as any discussions with any relevant regulatory or
other third party reasonably related to the same and (ii) Grantee may revoke
such notice of surrender by delivery of a notice of revocation to Issuer and,
upon delivery of such notice of revocation, the Exercise Termination Date shall
be extended to a date six months from the date on which the Exercise Termination
Date would have occurred if not for the provisions of this Section 15(c) (during
which period Grantee may exercise any of its rights hereunder, including any and
all rights pursuant to this Section 15).

            (d) Grantee shall have rights substantially identical to those set
forth in paragraphs (a), (b) and (c) of this Section 15 with respect to the
Substitute Option and the Substitute Option Issuer during any period in which
the Substitute Option Issuer would be required to repurchase the Substitute
option pursuant to Section 9.

         16. The parties hereto acknowledge that damages would be an inadequate
remedy for a breach of this Agreement by either party hereto and that the
obligations of the parties hereto shall be enforceable by either party hereto
through injunctive or other equitable relief.

         17. If any term, provision, covenant or restriction contained in this
Agreement is held by a court or a federal or state regulatory agency of
competent jurisdiction to be invalid, void or unenforceable, the remainder of
the terms, provisions and covenants and restrictions contained in this Agreement
shall remain in full force and effect, and shall in no way be affected, impaired
or invalidated. If for any reason such court or regulatory agency determines
that the Holder is not permitted to acquire, or Issuer is not permitted to
repurchase pursuant to Section 7, the full number of shares of Common Stock
provided in Section 1(a) hereof (as adjusted pursuant to Section 1(b) or 5
hereof), it is the express intention of Issuer to allow the Holder to acquire or
to require Issuer to repurchase such lesser number of shares as may be
permissible, without any amendment or modification hereof.

         18. All notices, requests, claims, demands and other communications
hereunder shall be deemed to have been duly given when delivered in person, by
cable, telegram, telecopy or telex, or by registered or certified mail (postage
prepaid, return receipt requested) at the respective addresses of the parties
set forth in the Merger Agreement.

         19. This Agreement shall be governed by and construed in accordance
with the laws of the Commonwealth of Massachusetts regardless of the laws that
might otherwise govern under applicable principles of conflicts of laws thereof.

                                       15
<PAGE>   16

         20. This Agreement may be executed in two or more counterparts, each of
which shall be deemed to be an original, but all of which shall constitute one
and the same agreement.

         21. Except as otherwise expressly provided herein, each of the parties
hereto shall bear and pay all costs and expenses incurred by it or on its behalf
in connection with the transactions contemplated hereunder, including fees and
expenses of its own financial consultants, investment bankers, accountants and
counsel.

         22. Except as otherwise expressly provided herein or in the Merger
Agreement, this Agreement contains the entire agreement between the parties with
respect to the transactions contemplated hereunder and supersedes all prior
arrangements or understandings with respect thereof, written or oral. The terms
and conditions of this Agreement shall inure to the benefit of and be binding
upon the parties hereto and their respective successors and permitted assigns.
Nothing in this Agreement, expressed or implied, is intended to confer upon any
party, other than the parties hereto, and their respective successors except as
assigns, any rights, remedies, obligations or liabilities under or by reason of
this Agreement, except as expressly provided herein.

         23. Capitalized terms used in this Agreement and not defined herein
shall have the meanings assigned thereto in the Merger Agreement.

                    *                   *                   *

                                       16
<PAGE>   17

         IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.

                                           GBT BANCORP

                                           By:_________________________________
                                           Name:  David L. Marsh
                                           Title: President and Chief Executive
                                                  Officer

                                           ANDOVER BANCORP, INC.

                                           By:_________________________________
                                           Name:  Gerald T. Mulligan
                                           Title: President and Chief Executive
                                                  Officer

                                       17<PAGE>   1

                                                        NAME: __________________

                            EXECUTIVE SEVERANCE PLAN

COMPANY:                       INFINIUM SOFTWARE, INC.
EFFECTIVE AS OF:               OCTOBER 1, 1999
EXECUTIVE'S PRINCIPAL TITLES:  ______________________________________________

If the Executive's employment with the Company is terminated by the Company, not
for "cause", and the Executive executes a one year Non-Competition Agreement in
form satisfactory to the Company, (a) the Company will continue to pay to the
Executive, for the twelve month period beginning on the termination date, his or
her ANNUAL BASE SALARY (as such term is defined in the Executive Compensation
Plan executed by the Company and the Executive) for the Fiscal Year in which the
termination date occurs and (b) the Executive will be entitled to continue to
participate in all of the Company's employee benefits programs (except to the
extent prohibited by the plans) for the twelve month period beginning on the
termination date.

This paragraph shall apply if a Change in Control (as defined in the attached
Appendix to this Plan) occurs. All of the Executive's unvested stock options
shall vest immediately upon the occurrence of a Change in Control. In the event
of a Change of Control, if the Executive is terminated not for "cause," (a) the
Company will continue to pay to the Executive, for the twelve month period
beginning on the termination date, his or her ANNUAL BASE SALARY and TARGET
EXECUTIVE BONUS (as such term is defined in the Executive Compensation Plan
executed by the Company and the Executive) for the Fiscal Year in which the
termination date occurs and (b) the Executive will be entitled to continue to
participate in all of the Company's employee benefits programs (except to the
extent prohibited by the plans) for the twelve month period beginning on the
termination date. If the Executive is not offered a position which is comparable
both in level and total compensation to the position he or she occupied
immediately before the Change in Control, he or she shall be deemed to have been
terminated not for "cause" and the provisions of the preceding sentence shall
apply.

For purposes of this agreement, "cause" is defined as follows: substantial and
continued failure to perform job duties; disloyalty, gross negligence, or breach
of fiduciary duty to the Company; commission of fraud, embezzlement, dishonesty
or deliberate disregard of the Company's rules or policies; unauthorized
disclosure of a trade secret or confidential business information; use of any
illicit drug or the abuse of any drug, alcohol or medication which adversely
affects the Executive's performance; or conviction of a felony offense.

Executive                                 For: INFINIUM SOFTWARE, INC.

Signature: _________________________      Signature: ___________________________
                                                     Robert A. Pemberton, CEO

Date: ______________________________      Date: ________________________________

<PAGE>   2

                                   Appendix A
                           to Executive Severance Plan

A "Change in Control" shall mean:

                  (1)      the acquisition by an individual, entity or group
                           (within the meaning of Section 13(d)(3) or 14(d)(2)
                           of the Securities Exchange Act of 1934, as amended
                           (the "Exchange Act")) (a "Person") of beneficial
                           ownership of any capital stock of the Company if,
                           after such acquisition, such Person beneficially owns
                           (within the meaning of Rule 13d-3 promulgated under
                           the Exchange Act) 50% or more of either (x) the
                           then-outstanding shares of common stock of the
                           Company (the "Outstanding Company Common Stock") or
                           (y) the combined voting power of the then-outstanding
                           securities of the Company entitled to vote generally
                           in the election of directors (the "Outstanding
                           Company Voting Securities"); PROVIDED, HOWEVER, that
                           for purposes of this subsection (i), the following
                           acquisitions shall not constitute a Change in Control
                           Event: (A) any acquisition directly from the Company
                           (excluding an acquisition pursuant to the exercise,
                           conversion or exchange of any security exercisable
                           for, convertible into or exchangeable for common
                           stock or voting securities of the Company, unless the
                           Person exercising, converting or exchanging such
                           security acquired such security directly from the
                           Company or an underwriter or agent of the Company),
                           (B) any acquisition by any employee benefit plan (or
                           related trust) sponsored or maintained by the Company
                           or any corporation controlled by the Company, or (C)
                           any acquisition by any corporation pursuant to a
                           Business Combination (as defined below) which
                           complies with clauses (x) and (y) of subsection (iii)
                           of this definition; or

                  (2)      such time as the Continuing Directors (as defined
                           below) do not constitute a majority of the Board (or,
                           if applicable, the Board of Directors of a successor
                           corporation to the Company), where the term
                           "Continuing Director" means at any date a member of
                           the Board (x) who was a member of the Board on the
                           date this Severance Agreement was signed or (y) who
                           was nominated or elected subsequent to such date by
                           at least a majority of the directors who were
                           Continuing Directors at the time of such nomination
                           or election or whose election to the Board was
                           recommended or endorsed by at least a majority of the
                           directors who were Continuing Directors at the time
                           of such nomination or election; PROVIDED, HOWEVER,
                           that there shall be excluded from this clause (y) any
                           individual whose initial assumption of office
                           occurred as a result of an actual or threatened
                           election contest with respect to the election or
                           removal of directors or other actual or threatened
                           solicitation of proxies or consents, by or on behalf
                           of a person other than the Board; or

<PAGE>   3

                  (3)      the consummation of a merger, consolidation,
                           reorganization, recapitalization or statutory share
                           exchange involving the Company or a sale or other
                           disposition of all or substantially all of the assets
                           of the Company (a "Business Combination"), unless,
                           immediately following such Business Combination, each
                           of the following two conditions is satisfied: (x) all
                           or substantially all of the individuals and entities
                           who were the beneficial owners of the Outstanding
                           Company Common Stock and Outstanding Company Voting
                           Securities immediately prior to such Business
                           Combination beneficially own, directly or indirectly,
                           more than 50% of the then-outstanding shares of
                           common stock and the combined voting power of the
                           then-outstanding securities entitled to vote
                           generally in the election of directors, respectively,
                           of the resulting or acquiring corporation in such
                           Business Combination (which shall include, without
                           limitation, a corporation which as a result of such
                           transaction owns the Company or substantially all of
                           the Company's assets either directly or through one
                           or more subsidiaries) (such resulting or acquiring
                           corporation is referred to herein as the "Acquiring
                           Corporation") in substantially the same proportions
                           as their ownership of the Outstanding Company Common
                           Stock and Outstanding Company Voting Securities,
                           respectively, immediately prior to such Business
                           Combination and (y) no Person (excluding the
                           Acquiring Corporation or any employee benefit plan
                           (or related trust) maintained or sponsored by the
                           Company or by the Acquiring Corporation) beneficially
                           owns, directly or indirectly, 50% or more of the
                           then-outstanding shares of common stock of the
                           Acquiring Corporation, or of the combined voting
                           power of the then-outstanding securities of such
                           corporation entitled to vote generally in the
                           election of directors (except to the extent that such
                           ownership existed prior to the Business Combination).

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