Document:

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                                                                    EXHIBIT 10.6

                  SECURITY AGREEMENT AND ASSIGNMENT OF ACCOUNT
                  --------------------------------------------

                                                         Date:  February 7, 2001

TO:  FLEET NATIONAL BANK (the "Bank"), a national banking association having its
Head Office at 100 Federal Street, Boston, Massachusetts 02110:

     1.   ASSIGNMENT OF ACCOUNT.  FOR VALUE RECEIVED, and in consideration of
the Bank giving, in its discretion, time, credit or banking facilities or
accommodations to NaviSite Inc. (the "Company" or the "Borrower"), the
undersigned (jointly and severally if more than one) hereby pledges, assigns and
transfers all of its right, title and interest in and to, and grants to the Bank
a security interest in all mutual funds, cash, instruments, securities and other
investment property now or hereafter as maintained or held in that certain Loan
Collateral Account # OFFK 522 137343 - LC (collectively, "Collateral") in an
aggregate amount of not less than $554,730.00 or such greater amount which
constitutes all Obligations to the Bank, together with all interest, dividends
and income thereon and all sums now or at any time hereafter on deposit therein
or due thereon and any instruments, investments, securities or other investment
property purchased with the proceeds thereof, and any and all proceeds and
products of any of the foregoing (collectively, the "Account"), as collateral
security for the payment and performance of the following (collectively, the
"Obligations"): the obligations of the Borrower and the undersigned to the Bank
or any of its branches and affiliates of every kind and description, whether
direct or indirect, absolute or contingent, primary or secondary, joint or
several, due or to become due, now existing or hereafter arising or acquired
arising from a standby letter of credit number 1S50103386 in an aggregate amount
of not less than $504,300.00 (together with all agreements and instruments
executed in connection with any of the foregoing, and as the same may from time
to time be modified, amended, extended or replaced, the "Loan Documents").  The
Bank hereby agrees that if at any time, any of the Obligations have matured and
are indefeasibly repaid in full, the Bank shall immediately reduce the amount
required to be held in the Account by the amount of such repayment.  In
addition, the Bank hereby agrees that if at any time, any of the obligations are
permanently reduced (but not reduced to zero), the Bank shall reduce the amount
required to be held by the Bank in the Account by the amount of such permanent
reduction.

     2.   REPRESENTATIONS, WARRANTIES AND COVENANTS.
          -----------------------------------------

     2.1  The undersigned represents and warrants that (a) the undersigned has
the right and legal authority to execute and deliver this Assignment; (b) except
for any financing statement which may have been filed by the Bank, no financing
statement covering the Account has been filed with any filing office; (c) no
other assignment or security agreement has been executed with respect to the
Account; (d) the Account is not is subject to any liens, offsets or rights of
any person or entity other than the Bank; (e) if the undersigned is a
corporation, the opening of the Account, the deposit of funds therein and the
assignment and pledge thereof pursuant to the terms of this Assignment have been
authorized by all necessary corporate action and do not contravene any provision
of its constituent documents or any law, regulation, decree, order or agreement
binding on the undersigned; and (f) this Assignment represents the legal, valid
and binding obligation of the undersigned, enforceable in accordance with its
terms.

     2.2  So long as any of the Obligations remain outstanding, the undersigned:
(a) will execute and deliver to the Bank all such other documents, and take such
other actions, as and when the Bank may from time to time request in order to
more fully evidence and perfect the Bank's interest in the Account; (b) will not
take or permit to be taken any action of any kind with respect to the Account,
including any attempt to transfer, assign or create in favor of any party other
than the Bank a security interest in, the Account; (c) will not make, or allow
to be made, any withdrawals from the Account and will not close the Account; and
(d) will immediately segregate from all other funds of the undersigned and hold
in trust for the Bank any funds received from the Account in violation of this
Assignment, and will not exercise dominion or control over such funds except to
pay them immediately into the Account.
<PAGE>

     3.   DEFAULT; REMEDIES.  Upon the occurrence of any default in the payment
or performance of any obligation under this Assignment or any other Obligation
(after giving effect to any grace periods applicable thereto) and so long as
such default shall be continuing, the Bank may declare the Obligations
immediately due and payable and may (i) withdraw immediately all or any portion
of the funds on deposit in or payable on the Account, and apply such funds to
the payment of the Obligations in such order and manner as the Bank, in its sole
discretion, may elect; (ii) on behalf of the undersigned endorse the name of the
undersigned upon any checks, drafts, or other instruments payable to the
undersigned evidencing payment on the Account; (iii) surrender or present for
withdrawal the passbook, certificate or other documents issued to the
undersigned in connection with the Account; (iv) liquidate any Collateral on
such terms as the Bank may determine whether by private or public sale and
notify any third party, including the Securities Intermediary, to liquidate the
Collateral on behalf of the Bank and direct the proceeds thereof to the Bank for
application to payment of the Obligations in such order as the Bank may
determine.  All transaction costs relating to exercise of any of the Bank's
rights or remedies hereunder shall be borne by the undersigned and the Bank may
deduct any such costs from proceeds of the Collateral before application of such
proceeds to the Obligations.  Any such third party may rely on this Assignment
as conclusive evidence that the Bank has the power and authority to provide any
notice or direction relating to the Collateral as the Bank deems necessary in
order to exercise any rights and remedies available to the Bank relating to the
Collateral.

     4.   BANK AS ATTORNEY-IN-FACT.  The undersigned appoints the Bank as its
attorney-in-fact for the purposes of carrying out the provisions of this
Assignment and taking any action and executing any instrument that the Bank may
deem necessary or advisable to accomplish the purposes hereof.  This power of
attorney shall be irrevocable and shall not terminate upon the death or any
disability of the undersigned.

     5.   RIGHTS OF BANK; INDEMNIFICATION.
          -------------------------------

     5.1  The Bank shall not be liable for its failure to use due diligence in
the collection of the Obligations, or for any action or omission in connection
therewith, or for any loss of interest on, or penalty assessed against, funds in
or payable on the Account as a result of the Bank's exercising any of its rights
or remedies under this Assignment.  The Bank may exercise its rights with
respect to the Account and the Collateral without resorting, or regard, to other
collateral or sources of reimbursement for the Obligations.  No delay or
omission on the part of the Bank in exercising any right shall operate as a
waiver of such right or any other right.  A waiver on any one occasion shall not
bar or waive the exercise of any right on any future occasion.  All rights and
remedies of the Bank, whether evidenced hereby or by any other agreement, are
cumulative and not exclusive of any remedies provided by law or any other
agreement, and may be exercised separately or concurrently.

     5.2  The undersigned shall indemnify and hold harmless the Bank from and
against any liability or damage which the Bank may incur in the exercise and
performance, in good faith, of any of the Bank's powers and duties set forth
herein.

     6.   WAIVERS BY THE UNDERSIGNED.  The undersigned waives presentment,
demand, notice, protest, notice of acceptance of this Assignment, notice of any
loans made, credit or other extensions granted, collateral received or delivered
or any other action taken in reliance hereon and all other demands and notices
<PAGE>

of any description, except for such demands and notices as are expressly
required to be provided to the undersigned under this Assignment or any other
document evidencing the Obligations.  With respect to both the Obligations and
the Account, the undersigned assents to any extension or postponement of the
time of payment or any other forgiveness or indulgence, to any substitution,
exchange or release of any collateral securing the Obligations, to the addition
or release of any party or person primarily or secondarily liable, to the
acceptance of partial payment thereon and the settlement, compromise or
adjustment of any thereof, all in such manner and at such time or times as the
Bank may deem advisable.  The undersigned waives all rights against the Borrower
arising hereunder by way of subrogation, reimbursement, indemnification,
contribution or otherwise; the undersigned will not prove any claim in
competition with the Bank in respect of any payment hereunder in bankruptcy or
insolvency proceedings of any nature; and the undersigned will not claim any
set-off or counterclaim against the Borrower in respect of any liability of the
undersigned to the Borrower.

     7.   NOTICES.  Any demand upon or notice to the undersigned that the Bank
may give shall be effective when delivered by hand, properly deposited in the
mails postage prepaid, or sent by telex, answer back received, or electronic
facsimile transmission, receipt acknowledged, or delivered to a telegraph
company or overnight courier, in each case addressed to the undersigned at the
address shown next to its signature at the end of this Assignment or as it
appears on the books and records of the Bank.  Demands or notices addressed to
any other address at which the Bank customarily communicates with the
undersigned also shall be effective.  Any notice by the undersigned to the Bank
shall be given as aforesaid, addressed to the Bank at the address shown at the
beginning of this Assignment or such other address as the Bank may advise the
undersigned in writing.

     8.   TERMINATION; REINSTATEMENT.  This Assignment shall remain in full
force and effect until the Obligations have been repaid in full and the Bank
shall have no further obligation to extend credit to the Borrower or the
undersigned.

     9.   SUCCESSORS AND ASSIGNS.  This Assignment shall be binding upon the
undersigned, its successors and assigns, and shall inure to the benefit of and
be enforceable by the Bank and its successors and assigns.  Without limiting the
generality of the foregoing sentence, the Bank may transfer any agreement or any
note held by it evidencing, securing or otherwise executed in connection with
the Obligations, or sell participations in any interest therein, to any other
person or entity, and such other person or entity shall thereupon become vested,
to the extent set forth in the agreement evidencing such assignment, transfer or
participation, with all the rights in respect thereof granted to the Bank
herein.

     10.  GENERAL.  The provisions of this Assignment may not be amended,
modified or waived except by a writing signed by the undersigned and the Bank,
nor may the undersigned assign any of its rights hereunder. This Assignment and
the terms, covenants and conditions hereof shall be construed in accordance
with, and governed by, the laws of The Commonwealth of Massachusetts (without
giving effect to any conflicts of law provisions contained therein). In the
event that the Account is held or stands in the name of the undersigned and
another or others jointly, the Bank may deal with the same for all purposes as
if it belonged to or stood in the name of the undersigned alone. Section
headings are for convenience of reference only and are not a part of this
Assignment.

     11.  JURY WAIVER.  THE BANK (BY ITS ACCEPTANCE OF THIS ASSIGNMENT) AND THE
UNDERSIGNED AGREE THAT NEITHER OF THEM NOR ANY ASSIGNEE OR SUCCESSOR SHALL (A)
SEEK A JURY TRIAL IN ANY LAWSUIT, PROCEEDING, COUNTERCLAIM, OR ANY OTHER ACTION
<PAGE>

BASED UPON, OR ARISING OUT OF, THIS ASSIGNMENT, ANY RELATED INSTRUMENTS, ANY
COLLATERAL OR THE DEALINGS OR THE RELATIONSHIP BETWEEN OR AMONG ANY OF THEM, OR
(B) SEEK TO CONSOLIDATE ANY SUCH ACTION WITH ANY OTHER ACTION IN WHICH A JURY
TRIAL CANNOT BE OR HAS NOT BEEN WAIVED.  THE PROVISIONS OF THIS PARAGRAPH SHALL
BE SUBJECT TO NO EXCEPTIONS.  NEITHER THE BANK NOR THE UNDERSIGNED HAS AGREED
WITH OR REPRESENTED TO THE OTHER THAT THE PROVISIONS OF THIS PARAGRAPH WILL NOT
BE FULLY ENFORCED IN ALL INSTANCES.

     IN WITNESS WHEREOF, the undersigned has caused this Assignment to be duly
executed as an instrument under seal as of the date first written above.

                                    NAVISITE INC.

                                    /s/ Kenneth W. Hale     as CFO
                                    ------------------------------
                                    By: Kenneth W. Hale
                                    Title: Chief Financial Officer<PAGE>

                                                                    EXHIBIT 10.2

                                  CMGI, INC.

            AMENDED AND RESTATED 1995 EMPLOYEE STOCK PURCHASE PLAN

1.   Purpose.  This 1995 Employee Stock Purchase Plan (as amended and restated,
     -------
the "Plan") is intended to encourage and assist employees of CMGI, Inc. (the
"Corporation") and the employees of any present or future designated
subsidiaries of the Corporation in acquiring a stock ownership interest in the
Corporation. The Plan is intended to be an Employee Stock Purchase Plan under,
and complying with, the terms and conditions of Section 423 of the Internal
Revenue Code of 1986, as amended, and the regulations promulgated thereunder
(the "Code").

2.   Stock Subject to the Plan.  Subject to adjustment pursuant to Section 12 of
     -------------------------
the Plan, the aggregate number of shares of Common Stock, $.01 par value per
share, of the Corporation (the "Common Stock") which may be sold under this Plan
pursuant to the exercise of non-transferable options granted under this Plan to
participating employees is 56,000,000 (as adjusted through June 9, 2000), less
such number of shares as may from time to time be issued pursuant to the
Corporation's 1986 Stock Option Plan, as amended and/or restated from time to
time. The shares may be authorized but unissued, or reacquired, shares of Common
Stock. The Corporation during the term of the Plan shall at all times reserve
and keep available such number of shares of Common Stock as shall be sufficient
to satisfy the requirements of the Plan.

3.   Quarterly Periods.  As used herein, the term "quarterly period" shall mean
     -----------------
the three-month period beginning on the first day of each of the Corporation's
fiscal quarters and ending on the last day of each of the Corporation's fiscal
quarters.

4.   Eligibility.  Any employee of the Corporation or any of its present or
     -----------
future designated subsidiaries (except (a) any employee who, immediately after
the grant of an option hereunder, directly or by attribution owns stock
possessing 5% or more of the total combined voting power or value of all classes
of stock of the Corporation or any subsidiary of the Corporation, or (b) any
employee whose customary employment is 20 hours or less per week, or (c) any
employee whose customary employment is for not more than five months in any
calendar year) is eligible to participate in the Plan on the first day of the
first quarterly period following commencement of employment.  Any subsidiary of
the Corporation, including future subsidiaries, may or may not be designated by
the Board of Directors of the Corporation as a subsidiary whose employees may
participate in the Plan as provided above.

     For purposes of the Plan, "subsidiary" shall have the meaning set forth in
Section 424(f) of the Code.

5.   Participation.  Any eligible employee's participation in the Plan shall be
     -------------
effective as of the first day of the quarterly period following the day on which
the employee
<PAGE>

completes, signs and returns to the Corporation a Stock Purchase Plan
Application and Payroll Deduction Authorization form indicating his or her
acceptance of and agreement to the terms and conditions of the Plan and
indicating the employee's standing level of contribution to the Plan in
accordance with Paragraph 6 below. Participation of any employee in the Plan is
entirely voluntary. All eligible employees who elect to participate in the Plan
shall have the same rights and privileges. Unless an employee files a new form
or withdraws from the Plan, his or her deductions and purchases will continue at
the same rate for future quarterly periods as long as the Plan remains in
effect.

     Any employee participating in the Plan or receiving shares of Common Stock
hereunder shall have no rights with respect to continuation of employment with
the Corporation or any subsidiary, nor with respect to continuation of any
particular Corporation business, policy or product, including the Plan.

6.   Deductions.  Any employee electing to participate in the Plan must
     ----------
authorize a whole percentage (not less than 1% nor more than 10%) or a whole
dollar amount (not less than $10.00) of the employee's regular pay to be
deducted by the Corporation from the employee's regular pay during each
quarterly period, provided that in no event may such percentage or amount result
in total deductions of less than $100.00 per quarterly period for such employee.

     Notwithstanding the foregoing, no employee shall be entitled to purchase
shares of Common Stock under the Plan with an aggregate fair market value
(determined at date of grant) exceeding $6,250 per quarterly period; and
furthermore, no employee shall be permitted to purchase shares of common stock
under all the employee stock purchase plans of the Corporation and its
subsidiaries at a rate which exceeds $25,000 in fair market value of such stock
(determined at the time the options are granted) per calendar year in which any
such option granted to such employee is outstanding at any time.

     An employee may elect to have amounts deducted from his or her pay, as
described above, by delivering to the Corporation a Stock Purchase Plan
Application and Payroll Deduction Authorization form stating the percentage or
amount to be deducted.  If an employee has not filed such a standing election
prior to the commencement date of a quarterly period, he or she will be deemed
to have elected not to have any of his or her pay withheld.  Deductions may be
increased or decreased during a quarterly period by filing a new standing
election, which will be effective during the first full pay period subsequent to
its filing and processing.

     No employee will be permitted to make contributions for any period during
which he or she is not receiving pay from the Corporation or one of its present
or future designated subsidiaries.

7.   Issuance of Shares.  On the last trading day of each quarterly period so
     ------------------
long as the Plan shall remain in effect, and provided the employee has not
before that date advised the Corporation that he or she elects to withdraw his
or her entire account, the Corporation shall apply the funds in the employee's
account as of that date to the purchase of authorized but unissued, or
reacquired, shares of Common Stock in units of one share or whole multiples
thereof.

                                       2
<PAGE>

     The cost to each employee for the shares of Common Stock so purchased shall
be eighty-five percent (85%) of the lower of the fair market value of the Common
Stock on the first trading day of the quarterly period (the "date of grant")
and the fair market value of the Common Stock on the last trading day of the
quarterly period (the "date of exercise"), determined as follows:

     (1)  The fair market value of the shares on the date of the grant shall be
          the mean between the average bid and ask prices of the stock in the
          over-the-counter market as quoted on the National Association of
          Securities Dealers Automatic Quotation System (NASDAQ), or if its
          stock is quoted on the Nasdaq National Market the last reported sales
          price of the stock, or if the stock is traded on one or more
          securities exchanges the average of the closing prices on all such
          exchanges on the date of grant; and

     (2)  The fair market value of the shares on the date of exercise shall be
          the mean between the average bid and ask prices of the stock in the
          over-the-counter market as quoted on the National Association of
          Securities Dealers Automatic Quotation System (NASDAQ), or if its
          stock is quoted on the Nasdaq National Market the last reported sales
          price of the stock, or if the stock is traded on one or more
          securities exchanges the average of the closing prices on all such
          exchanges on the date of exercise.

     Any amount remaining in an employee's account at the end of a quarterly
period after application to the purchase of shares of Common Stock shall be
refunded to the employee, except that any amount remaining in an employee's
account equal to less than the sum required to purchase one share shall, unless
otherwise requested by the employee, be held in the employee's account for use
during the next quarterly period.  Any amount remaining in such employee's
account by reason of his or her prior election to withdraw his or her entire
account shall be disbursed to the employee within 30 days following such
election.  The Corporation shall as expeditiously as possible after the last day
of each quarterly period issue to the employee entitled thereto the certificate
evidencing the shares of Common Stock issuable to him or her as provided herein.

     Notwithstanding anything above to the contrary, (a) if the aggregate number
of shares of Common Stock employees desire to purchase at the end of any
quarterly period exceeds the number of shares then available under the Plan, the
shares available shall be allocated among such employees in proportion to their
contributions during the quarterly period (but no fractional shares shall be
issued); and (b) no funds in an employee's account shall be applied to the
purchase of shares and no shares hereunder shall be issued unless such shares
are covered by an effective registration statement under the Securities Act of
1933, as amended, or by an exemption therefrom.

8.   Termination of Participation.  An employee's participation in the Plan will
     ----------------------------
be terminated when the employee (a) voluntarily elects to withdraw his or her
entire account, (b) resigns or is discharged from the Corporation and all of its
present or future designated subsidiaries or (c) dies.  Upon termination of
participation, the employee shall not be entitled to rejoin the Plan until the
first day of the quarterly period immediately

                                       3
<PAGE>

following the quarterly period in which the termination of participation occurs.
Upon termination of participation, the employee shall be entitled to the amount
of his or her individual account within thirty (30) days.

     If, prior to the last day of the quarterly period, the designated
subsidiary by which an employee is employed shall cease to be a subsidiary of
the Corporation, or if the employee is transferred to a subsidiary of the
Corporation that is not a designated subsidiary, the employee shall be deemed to
have been discharged from the Corporation and all designated subsidiaries for
purposes of the Plan.

9.   Beneficiary.  Each employee may file a written designation of a beneficiary
     -----------
who is to receive any shares of Common Stock credited to such employee's account
under the Plan in the event of the death of such employee prior to delivery to
such employee of the certificates for such shares.  Such designation may be
changed by the employee at any time by written notice received by the
Corporation.

     Upon the death of an employee, his or her account shall be paid or
distributed to the beneficiary or beneficiaries designated by such employee, or
in the absence of such designation, to the executor or administrator of his or
her estate, and in either event the Corporation shall not be under any further
liability to anyone.  If more than one beneficiary is designated, each
beneficiary shall receive an equal portion of the account unless the employee
indicates to the contrary in his or her designation, provided that the
Corporation may in its sole discretion make distributions in such form as will
avoid the creation of fractional shares.

10.  Administration of the Plan.  The Plan shall be administered by the
     --------------------------
Compensation Committee of the Board of Directors of the Corporation.  All terms
of the Plan shall be subject to interpretation by the Compensation Committee of
the Board of Directors whose decision shall be final and binding on all parties.
All costs and expenses incurred in administering the Plan shall be paid by the
Corporation.

11.  Modification and Termination.  The Corporation expects to continue the Plan
     ----------------------------
until such time as the shares of Common Stock reserved for issuance under the
Plan have been sold.  The Corporation reserves, however, the right to amend,
alter or terminate the Plan in its discretion.  Upon termination of the Plan,
each employee shall be entitled to the amount of his or her individual account
within thirty (30) days after such termination.

12.  Adjustments upon Changes in Capitalization; Change of Control.  Appropriate
     -------------------------------------------------------------
and proportionate adjustments shall be made in the number and class of shares of
stock subject to this Plan, and to the rights granted hereunder and the prices
applicable to such rights, in the event of a stock dividend, stock split,
reverse stock split, recapitalization, reorganization, merger, consolidation,
acquisition, separation or other similar change in the capital structure of the
Corporation.

     If the Corporation shall at any time merge or consolidate with another
corporation and the holders of the capital stock of the Corporation immediately
prior to such merger or consolidation do not continue to hold at least 50% by
voting power of the capital stock of the surviving corporation, or in the event
of a sale of all or substantially all of the

                                       4
<PAGE>

assets of the Corporation, all outstanding options under the Plan shall be
deemed cancelled as of the effective date of any such transaction, provided that
notice of such cancellation shall be given to each holder of an option, and each
holder of an option shall have the right to exercise such option in full based
on payroll deductions then credited to his account as of a date determined by
the Board of Directors.

13.  Transferability of Rights.  No rights of any employee under this Plan shall
     -------------------------
be transferable by him or her, by operation of law or otherwise, except to the
extent that an employee is permitted to designate a beneficiary or beneficiaries
as herein above provided, and except to the extent permitted by will or the laws
of descent and distribution if no such beneficiary be designated.

14.  Participation in Other Plans.  Nothing herein contained shall affect an
     ----------------------------
employee's right to participate in and receive benefits under and in accordance
with the then current provisions of any pension, insurance or other employee
welfare plan or programs of the Corporation.

15.  Applicable Law. The interpretation, performance and enforcement of this
     --------------
Plan shall be governed by the laws of the State of Delaware.

16.  Notification upon Sale of Shares. Each employee agrees, by participating in
     --------------------------------
the Plan, to promptly give the Corporation notice of any disposition of shares
purchased under the Plan where such disposition occurs within two years after
the date of grant of the option pursuant to which such shares were purchased or
one year after the date of exercise of the option.

17.  Effective Date of Plan; Governmental Regulation.  The Plan was effective on
     -----------------------------------------------

February 1, 1995.  The Plan was amended and restated on June 9, 2000, effective
August 1, 2000.  The Corporation's obligation to offer, sell or deliver shares
of Common Stock under the Plan is subject to any governmental approval required
in connection with the authorized issuance or sale of such shares and is further
subject to the determination by the Corporation that is has complied with all
applicable securities laws.

                                   * * * * *

                                       5
<PAGE>

                                  CMGI, INC.

                              AMENDMENT NO. 1 TO
            AMENDED AND RESTATED 1995 EMPLOYEE STOCK PURCHASE PLAN

     The Amended and Restated 1995 Employee Stock Purchase Plan (the "Plan") of
CMGI, Inc., a Delaware corporation (the "Corporation"), is hereby amended as
follows:

     Section 2 of the Plan is hereby amended and restated in its entirety to
read as follows:

     "2.  Stock Subject to the Plan.  Subject to adjustment pursuant to Section
          -------------------------
12 of the Plan, the aggregate number of shares of Common Stock, $.01 par value
per share, of the Corporation (the "Common Stock") which may be sold under this
Plan pursuant to the exercise of non-transferable options granted under this
Plan to participating employees is 1,000,000 (as adjusted through December 20,
2000). The shares may be authorized but unissued, or reacquired, shares of
Common Stock. The Corporation during the term of the Plan shall at all times
reserve and keep available such number of shares of Common Stock as shall be
sufficient to satisfy the requirements of the Plan."

                                   * * * * *

                                       6

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