Document:

<PAGE>

                                                                    EXHIBIT 4.16

                                                                  CONFORMED COPY

                          SCHRODER SALOMON SMITH BARNEY
        CITIGROUP CENTRE, 33 CANADA SQUARE, CANARY WHARF, LONDON E14 5LB

                                                               November 28, 2001

MARCONI MOBILE SPA

C/o
One Bruton St
London
W1J 6AQ

Ladies and Gentlemen:

Marconi Mobile SpA, a company organized under the laws of the Republic of Italy
(the "Seller"), proposes, subject to the terms and conditions stated herein, to
sell ordinary shares ("Shares"), of Lottomatica S.p.A, a company organized under
the laws of the Republic of Italy (the "Company"), to Salomon Brothers
International Limited (the "Purchaser"). An aggregate of 6,163,641 Shares (the
"Securities") are to be sold hereunder. The Securities will be purchased by the
Purchaser as a block trade subject to the rules and regulations of Consob and
the Mercato Telematico Azionario in relation to such trades, subject, however,
to the additional matters set out below. The Seller understands that the
Securities will be resold by the Purchaser. The Seller understands further that
such sales will occur as soon after this Agreement becomes effective as in the
sole judgment of the Purchaser is advisable.

1.       The Seller represents and warrants to, and agrees with, the Purchaser,
         as of the date hereof and as of the Closing Date that:

         (a)      It has full power under its constitutive documents and
                  applicable law, and all authorizations, approvals, consents
                  and licenses required by it have been unconditionally obtained
                  and are in full force and effect, to permit it to enter into
                  and perform this Agreement; and this Agreement has been duly
                  authorized, executed and delivered by it and is a valid and
                  binding agreement of it enforceable in accordance with its
                  terms;

         (b)      The sale and delivery of the Securities to be sold by it
                  hereunder and the compliance by it with all of the provisions
                  of this Agreement, as well as the consummation of the
                  transactions herein contemplated, will not conflict with or
                  result in a breach or violation of any of the terms or
                  provisions of, or constitute a default under, any indenture,
                  mortgage, deed of trust, loan agreement or other agreement or
                  instrument to which it is a party or by which it is bound or
                  to which any of its property or assets is subject, or any
                  statute or any order, rule or regulation of any court or
                  governmental agency or body having jurisdiction over it or its
                  property or assets, except for any such conflict, breach,
                  violation or default which has been waived or could not
                  reasonably be expected to have a material adverse effect on
                  the transactions contemplated by this Agreement;

<PAGE>

         (c)      No person has any conflicting right, contingent or otherwise,
                  to purchase or to be offered for purchase the Securities, or
                  any of them; it has valid title to, and the legal right and
                  the power to sell and transfer full beneficial legal interest
                  in, the Securities, and transfer of the Securities to the
                  Purchaser will pass title to such shares, free and clear of
                  all security interests, liens, encumbrances, equities or other
                  claims together with all rights and advantages now and
                  hereafter attaching to such Securities; the Securities rank
                  pari passu in all respects with and are identical to the
                  remaining ordinary shares of the Company;

         (d)      Neither it, nor any of its affiliates, nor any person acting
                  on its or their behalf, has or will make bids or purchases for
                  the purpose of creating actual or apparent active trading in,
                  or of raising the price of, any Shares or any right to
                  purchase such Shares or securities convertible into or
                  exchangeable or exercisable for Shares which is designed to or
                  which has constituted, or which might reasonably be expected
                  to cause or result in, manipulation of the price of any
                  security of the Company; and

         (e)      The Seller is not aware of any material information (including
                  without limitation any information regarding any material
                  adverse change or prospective material adverse change in the
                  condition of, or any actual, pending or threatened litigation,
                  arbitration or similar proceeding involving, the Company) that
                  is not described in the Company's most recent annual report or
                  subsequent public information releases which information is
                  necessary to enable investors to make an informed assessment
                  of the assets and liabilities, financial position, profits and
                  losses and prospects of the Company and its subsidiaries.

2.       Subject to the terms and conditions set forth in this Agreement, the:
         Seller agrees to sell the Securities to the Purchaser at a net price
         per Security of 6.52 euros (the "Purchase Price"), which equals
         40,186,939.32 euros in the aggregate for all the Securities to be
         purchased by the Purchaser. The Purchaser agrees to purchase the
         Securities at the Purchase Price.

3.       Unless otherwise agreed by the parties, completion of the sale and
         purchase of the Securities will take place on 3 December, 2001 (the
         "Closing Date"), by transfer of the Securities to an account or
         accounts in Monte Titoli of the Purchaser or its affiliate, designated
         by the Purchaser, against payment by or on behalf of the Purchaser of
         the Purchase Price multiplied by the number of Securities purchased by
         the Purchaser, in same-day funds.

4.       The Seller covenants and agrees with the Purchaser that it will notify
         the Purchaser forthwith if on or prior to the Closing Date it comes to
         the Seller's knowledge that any of the representations, warranties,
         undertakings or agreements set out in Section 1 above ceases to be true
         and accurate or becomes misleading in any respect or that there has
         been any breach of any of such representations, warranties,
         undertakings or agreements. The obligations of the Seller set forth in
         this Section 4 shall survive termination of this Agreement.

5.       The respective agreements, representations, warranties and other
         statements of the Seller and the Purchaser, as set forth in this
         Agreement or made by or on behalf of them, respectively, pursuant to
         this Agreement, shall remain in full force and effect, regardless of
         any investigation (or any statement as to the results thereof) made by
         or on behalf of the Purchaser or any controlling person of the
         Purchaser, or the Seller or any officer or director or any controlling
         person of the Seller, and shall survive delivery of and payment for the
         Securities.

6.       All statements, requests, notices and agreements hereunder shall be in
         writing, and shall be delivered or sent by mail or facsimile
         transmission, if to Salomon Brothers International Limited to Victoria
         Plaza, 111 Buckingham Palace Road, London SW1W 0SB, Attention: General
         Counsel's Office, fax: +44-20-7500 1023; and, if to the Seller to
         Marconi Mobile

<PAGE>

         SpA, c/o One Bruton St London W1J 6AQ, fax: 020 7 409 7748, Attention:
         The Secretary. Any such statements, requests, notices or agreements
         shall take effect upon receipt thereof.

7.       This agreement is governed by, and shall be construed in accordance
         with, English law. The Seller hereby agrees for the benefit of the
         Purchaser that the courts of England are to have jurisdiction to settle
         any disputes which may arise out of or in connection with this
         Agreement and that accordingly any suit, action or proceedings
         (together referred to as "Proceedings") arising out of or in connection
         with this Agreement may be brought in such courts. Nothing contained in
         this clause shall limit any right to take Proceedings against the
         Seller in any other court of competent jurisdiction, nor shall the
         taking of Proceedings in one or more jurisdictions preclude the taking
         of Proceedings in any other jurisdiction, whether concurrently or not.

8.       This Agreement may be executed by any one or both of the parties hereto
         in any number of counterparts and via facsimile, each of which shall be
         deemed to be an original, but all such counterparts shall together
         constitute one and the same instrument.

         If the foregoing is in accordance with your understanding, please sign
and return to us an original counterpart hereof, and upon the acceptance hereof
by you, this letter and such acceptance hereof shall constitute a binding
agreement among the Seller and the Purchaser.

Very truly yours,

SALOMON BROTHERS INTERNAL LIMITED

By: A. BOGLE
    Name:  Angus Bogle
    Title: Managing Director

Accepted as of the date hereof:

MARCONI MOBILE SPA

By: C. CHAPPLE
    Name:  C. J. C. Chapple
    Title: EVP Corporate Finance<PAGE>

                                                                  CONFORMED COPY

                                                                    EXHIBIT 4.22

To:      Barclays Bank PLC (the ("LENDER")
         5 The North Colonnade
         Canary Wharf
         London E14 4BB

                                                                   6 August 2002

Dear Sirs

THE SWAP TRANSACTIONS LISTED IN SCHEDULE 1 AND ENTERED INTO BETWEEN THE COMPANY
AND THE LENDER PURSUANT TO THE ISDA MASTER AGREEMENT DATED 16 SEPTEMBER 1999
(THE "SWAPS")

1.       INTERPRETATION

         Terms defined in the syndicated credit facility agreement dated 25
         March 1998 between Marconi Corporation plc (formerly known as The
         General Electric Company, p.l.c.), HSBC Investment Bank plc as agent
         and others (as amended from time to time, the "FACILITY AGREEMENT")
         shall, unless otherwise defined herein, have the same meaning when used
         in this letter.

2.       CLOSE OUT OF THE SWAPS

         We confirm our agreement to terminate the Swaps and any and all of the
         Lender's and the Company's payment obligations (whether absolute or
         contingent) thereunder with effect from 7 August 2002 (the "CLOSE OUT
         DATE"). As a consequence of such termination the net sum in an
         aggregate amount of USD $24,812,156.25 (the "SETTLEMENT AMOUNT") will
         become due from the Company to the Lender on the Close Out Date.

3.       DEEMED ADVANCE

         This Letter sets out our mutual agreement to treat the Settlement
         Amount as an advance (the "CLOSE OUT ADVANCE") deemed to have been lent
         to the Company by the Lender on the Close Out Date.

4.       INTEREST

         (a)      Interest shall accrue on the Close Out Advance from and
                  including the Close Out Date to (but excluding) the date on
                  which the Close Out Advance is repaid in full at the rate per
                  annum determined by the Lender to be the aggregate of:

                  (i)      LIBOR (which shall be the interest rate per annum
                           applicable to U.S. Dollar Advances under the Facility
                           Agreement or, if (x) no such rate is calculated under
                           the Facility Agreement, it shall be the rate offered
                           by the Lender to prime banks in the London interbank
                           market or, if (y) the interest rate applicable to
                           Advances under the Facility Agreement falls to be
                           determined pursuant to the provisions of Clause 13.3
                           (Alternative

<PAGE>

                           Rates) of the Facility Agreement, the interest rate
                           applicable to the Close Out Advance shall be the rate
                           per annum which expresses the cost to the Lender of
                           funding the Close Out Advance from whatever sources
                           it may reasonably select with a view to providing
                           funding at the lowest reasonable practicable rate);

                  (ii)     2.25 per cent. per annum; and

                  (iii)    an amount (as determined by the Lender acting
                           reasonably and calculated in accordance with the
                           current LMA recommended formula) sufficient to
                           indemnify the Lender for the costs (if any) imputed
                           to the Lender of compliance with the requirements of
                           the Financial Services Authority or the European
                           Central Bank in respect of the Close Out Advance;

         (b)      Interest payable on the Close Out Advance shall be calculated
                  by reference to interest periods (each an "INTEREST Period"):

                  (i)      the first Interest Period shall commence on the Close
                           Out Date and end on the day before the next Rollover
                           Date for outstanding Advances under the Facility
                           Agreement;

                  (ii)     subsequent Interest Periods shall have a duration of
                           one month or such other period as the Lender and the
                           Company may agree; and

                  (iii)    to the extent practicable, Interest Periods shall be
                           managed in order to ensure that the last day of each
                           Interest Period for the Close Out Advance shall fall
                           on the due date for the payment of interest on the
                           outstanding Advances under the Facility Agreement;

         (c)      Interest due from the Company under this Letter shall:

                  (i)      accrue from day to day at the rate calculated under
                           (a) above;

                  (ii)     be payable in arrear on the last day of each Interest
                           Period; and

                  (iii)    be calculated on the basis of the actual number of
                           days elapsed and a 360 day year.

5.       REPAYMENT

         The Close Out Advance shall be repayable by the Company (together with
         interest accrued thereon and any other amounts due or owing to the
         Lender under this Letter at such time) upon the demand of the Lender at
         any time (the "REPAYMENT DATE"), provided that the Lender shall not
         make demand until the earlier of:

         (a)      the date on which the Agent serves notice of acceleration
                  pursuant to the terms of the letter dated 22 March 2002 from
                  the Company and Marconi plc to the Agent;

         (b)      the date on which (i) a resolution is passed at a meeting of
                  the Company for (or to petition for) its winding up, or (ii)
                  the Company presents any petition for its

                                     - 2 -

<PAGE>

                  winding up or administration, or (iii) an order for the
                  winding up or administration of the Company is made, or (iv)
                  analogous procedures occur in relation to the Company in any
                  other country (including without limitation any moratorium or
                  suspension of payment proceedings and any voluntary or
                  involuntary proceedings under the United States Bankruptcy
                  Code);

         (c)      the date on which any scheme of arrangement in respect of the
                  Company is not approved by the relevant class of creditors at
                  the relevant meeting of creditors and/or such scheme is not
                  sanctioned at the relevant court hearing; or

         (d)      25 March 2003 or such other date as the Company and the Lender
                  may agree in writing;

6.       COSTS AND EXPENSES

         The Company shall promptly on demand pay the Lender the amount of all
         costs and expenses (including legal fees) reasonably incurred by any of
         them in connection with the negotiation, preparation, printing and
         execution of this Letter;

7.       ILLEGALITY

         If it becomes unlawful or contrary to any regulation in any
         jurisdiction for the Lender to give effect to any of its obligations as
         contemplated by this Letter or to fund or maintain the Close Out
         Advance, then the Lender may notify the Company accordingly and
         thereupon the Company shall, to the extent required and within the
         period allowed by such regulation or, if no period is allowed,
         forthwith, repay the Close Out Advance (together with interest accrued
         thereon and any other amounts due or owing to the Lender under this
         Letter at such time) PROVIDED THAT, without in any way limiting,
         reducing or otherwise qualifying the rights of the Lender, the Lender
         shall promptly upon becoming aware of the same notify the Company
         thereof and the Lender shall endeavour to transfer its rights and
         obligations in respect of the Close Out Advance to another financial
         institution not affected by the circumstances giving rise to such
         illegality, and shall otherwise take such reasonable steps as may be
         open to it to mitigate such circumstances. The Lender is not, however,
         required to take any action which would be prejudicial to it or which
         would conflict with its general banking policies, or give rise to any
         material cost or expense;

8.       PARI PASSU STATUS

         All claims of the Lender under this Letter shall rank pari passu with
         the claims of the Finance Parties under the Facility Agreement;

9.       TRANSFER

         The Lender may, following reasonable consultation with the Company,
         assign, transfer, novate or dispose of any of, or any interest in, its
         rights and/or obligations under this Letter to an Affiliate or to
         another bank or financial institution;

10.      CONFIDENTIALITY

                                     - 3 -

<PAGE>

         The Lender may disclose to any of its Affiliates or any person with
         whom it is proposing to enter, or has entered into, any kind of
         transfer, participation or other agreement in relation to this Letter:

         (i)      a copy of this Letter; and

         (ii)     any information which the Lender has acquired under or in
                  connection with this Letter;

         PROVIDED THAT the Lender shall not disclose any such information to a
         person unless that person has provided to the Company a confidentiality
         undertaking addressed to the Company in such form as the Company may
         reasonably require.

11.      DEFAULT INTEREST

         (a)      If the Company fails to pay any amount payable by it under
                  this Letter, it shall forthwith on demand by the Lender pay
                  interest on the overdue amount from the due date up to the
                  date of actual payment, both before and after judgment, at a
                  rate (the "DEFAULT RATE") determined by the Lender to be one
                  per cent. per annum above the rate which would have been
                  payable if the overdue amount had, during the period of
                  non-payment, constituted a Close Out Advance in the currency
                  of the overdue amount for such successive Interest Periods of
                  such duration as the Lender may determine (each a "DESIGNATED
                  TERM").

         (b)      The default rate will be determined two Business Days before
                  the first day of the relevant Designated Term.

         (c)      Default interest will be compounded at the end of each
                  Designated Term.

12.      TAXES

         (a)      All payments by the Company under this Letter shall be made
                  free and clear of and without deduction for or on account of
                  any Applicable Taxes (and for the purposes of this Letter, the
                  reference to "Borrower" in the definition of Applicable Taxes
                  in the Facility Agreement shall be deemed to be a reference to
                  the Company) except to the extent that the Company is required
                  by law to make payment subject to any Applicable Taxes.
                  Subject to paragraph (b) below, if any Applicable Taxes or
                  amounts in respect of Applicable Taxes must be deducted or
                  withheld from any amounts payable or paid by the Company to
                  the Lender under this Letter, the Company shall pay such
                  additional amounts as may be necessary to ensure that the
                  Lender receives and retains (after any deduction or
                  withholding in respect of such additional amounts) a net
                  amount equal to the full amount which it would have received
                  and so retained had payment not been made subject to
                  Applicable Taxes.

         (b)      The Company is not obliged to pay any additional amount
                  pursuant to paragraph (a) above in respect of any deduction
                  which would not have been required if the Lender had obtained
                  any exemption from the deduction or withholding of Applicable
                  Taxes which it is able to obtain.

                                     - 4 -

<PAGE>

         (c)      The Company will, within thirty days of the later of:

                  (i)      any payment being made in respect of which tax is
                           required by law to be deducted or withheld; or

                  (ii)     the date on which the Company is required to account
                           for the amount deducted or withheld to the
                           appropriate tax authority,

                  deliver to the Lender evidence (including any relevant tax
                  receipts) that the amount deducted or withheld has been duly
                  accounted for to the appropriate tax authority.

         (d)      The provisions of Clause 12.2 (a) (Qualifying Bank) of the
                  Facility Agreement shall apply in the same manner to the
                  Company's obligations under this paragraph 2 (with such
                  conforming changes as may be necessary to give effect to the
                  provisions of this Letter and the transactions contemplated
                  hereunder, including without limitation:

                  (i)      references to the "Signing Date" shall be deemed to
                           be references to the date of this Letter;

                  (ii)     references to "Bank" and "Obligor" shall be deemed to
                           be references to respectively the Lender and the
                           Company; and

                  (iii)    sub-paragraph (iii) of Clause 12.2(a) of the Facility
                           Agreement shall be deemed to refer to an assignment,
                           transfer, novation or disposition by the Lender
                           pursuant to paragraph 9 of this Letter).

         (e)      The provisions of Clause 12.5 (Tax Credit) of the Facility
                  Agreement shall apply in the same manner to any payment made
                  by the Company pursuant to this paragraph 2 (with such
                  conforming changes as may be necessary to give effect to the
                  provisions of this Letter and the transactions contemplated
                  hereunder, including without limitation:

                  (i)      references to "Obligor" shall be deemed to be
                           references to the Company;

                  (ii)     references to "Finance Party" and "Bank" shall be
                           deemed to be references to the Lender;

                  (iii)    references to "Finance Document" shall be deemed to
                           be references to this Letter; and

                  (iv)     references to all or any part of Clause 12 of the
                           Facility Agreement shall be deemed to be references
                           to paragraph 2 of this Letter).

13.      INCREASED COSTS

         (a)      Subject to paragraph (c) below, the Company shall within five
                  Business Days of demand by the Lender pay the Lender the
                  amount of any increased cost incurred by it or any of its
                  holding companies as a result of any change in (or change in
                  any official or judicial interpretation of) or introduction of
                  any law or regulation

                                     - 5 -

<PAGE>

                  (including any relating to taxation or reserve asset, special
                  deposit, cash ratio, liquidity or capital adequacy
                  requirements or any other form of banking or monetary
                  control).

                  For the purposes of this Letter "INCREASED COST" shall have
                  the meaning given to such term in Clause 15.1(b) of the
                  Facility Agreement, PROVIDED THAT:

                  (i)      references to "Finance Party" or "Party" shall be
                           deemed to be references to the "Lender";

                  (ii)     references to "Advance(s)" shall be deemed to be
                           references to the Close Out Advance; and

                  (iii)    references to "Agreement" shall be deemed to be
                           references to this Letter.

         (b)      The Lender shall notify the Company promptly upon becoming
                  aware that it has incurred an increased cost as a result of
                  any law or regulation referred to in paragraph (a) above and
                  shall provide calculations in reasonable detail of the basis
                  of such increased cost and its allocation to this Letter.

         (c)      Paragraph (a) does not apply to any increased cost:

                  (i)      compensated for by the payment of the costs referred
                           to in sub-paragraph (a)(iii) of paragraph 4 of this
                           Letter; or

                  (ii)     any part of which is attributable to the delay by the
                           Lender in notifying the Company of the increased
                           cost; or

                  (iii)    attributable to any tax or amounts in respect of tax
                           which must be deducted from any amounts payable or
                           paid by the Company to the Lender under this Letter
                           (or which would have been payable but for paragraph
                           12(d); or

                  (iv)     which is, or is attributable to, any tax on the
                           overall net income, profits or gains of the Lender or
                           any of its holding companies (or the overall net
                           income, profits or gains of a division or branch of
                           the Lender or any of its holding companies); or

                  (v)      resulting from the Lender breaching a regulation
                           imposed on it after the date of this Letter by any
                           fiscal, monetary or other regulatory authority.

14.      ENFORCEMENT COSTS

         The Company shall within five Business Days of demand pay to the Lender
         the amount of all reasonable costs and expenses (including legal fees)
         properly incurred by it in connection with the enforcement of, or the
         preservation of any rights under this Letter.

15.      STAMP DUTIES

         The Company shall pay and within five Business Days of demand indemnify
         the Lender against any liability it incurs in respect of any stamp,
         registration and similar tax which is or becomes payable in the U.K.
         directly attributable to the entry into, performance or

                                     - 6 -

<PAGE>

         enforcement of this Letter (other than in respect of any assignment,
         transfer, novation or disposition by the Lender pursuant to paragraph 9
         of this Letter).

16.      MISCELLANEOUS PROVISIONS

         The provisions of Clauses 27.3 (Waivers and remedies cumulative) and 32
         (Severability) of the Facility Agreement shall apply in the same manner
         to this Letter, with such conforming changes as may be necessary,
         including without limitation:

         (i)      references to the "Finance Documents" shall be deemed to be
                  references to this Letter; and

         (ii)     references to the "Finance Party" shall be deemed to be
                  references to the Lender.

17.      NOTICES

         Any notice or demand to be served by one person on another pursuant to
         this Letter may be served by leaving it at the address specified below
         (or such other address as such person may have most recently specified)
         or by letter posted by prepaid first-class post to such address (which
         shall be deemed to have been served on the second Business Day
         following the date of posting), or by fax to the fax number specified
         below (or such other number as such person may most recently have
         specified) (which shall be deemed to have been received when actually
         received by the recipient marked for the attention of the department or
         officer (if any) specified by the recipient for such purpose).

         Address for notices:

         COMPANY:

         Address:            1 Bruton Street
                             London W1J 6AQ

         Fax:                (020) 7493 1974

         Attention:          Group Treasurer/Group Assistant Treasurer

         THE LENDER

         Address:            5 The North Colonnade
                             Canary Wharf
                             London E14 4BB

         Fax:                020 7773 6811

         Email:              GSUTeam1@barcap.com

         Attention:          Geoff Miall/Sue Penfold

                                     - 7 -

<PAGE>

18.      REPRESENTATIONS

         The Company hereby represents to the Lender that:

         (a)      it has been duly incorporated in accordance with its laws of
                  its place of incorporation and is validly existing;

         (b)      this Letter is within its powers and the execution, delivery
                  and performance thereof has been duly authorised;

         (c)      this Letter constitutes its legal, valid, binding and
                  enforceable obligation (subject to applicable bankruptcy,
                  reorganisation, insolvency, moratorium or similar laws
                  affecting creditors' rights generally and subject, as to
                  enforceability, to equitable principles of general
                  application); and

         (d)      this Letter and the transactions contemplated thereunder do
                  not and will not contravene in any material respect (i) its
                  constitutional documents, (ii) any law or regulation in its
                  country of incorporation, or (iii) any loan stock, debenture,
                  mortgage in respect of Borrowings to which it is a party.

19.      COUNTERPARTS

         This Letter may be executed in any number of counterparts and this has
         the same effect as if the signatures on the counterparts were on a
         single copy of this Letter.

20.      GOVERNING LAW AND JURISDICTION

         This Letter shall be governed by English Law and, for the Lender's
         benefit, the English courts shall have exclusive jurisdiction to settle
         any dispute which may arise from or in connection with it.

Please confirm your agreement to the above by signing and returning to us the
enclosed copy of this Letter.

Yours faithfully

Steve Hare (signed)

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

For and on behalf of
MARCONI CORPORATION PLC

We hereby agree the above.

Barry Cole (signed)
-------------------

For and on behalf of
BARCLAYS BANK PLC

                                     - 8 -

<PAGE>

                                   SCHEDULE 1
                                   "THE SWAPS"

<TABLE>
<CAPTION>
REFERENCE NO:                         EFFECTIVE DATE:                    NOTIONAL AMOUNT:
<S>                                   <C>                                <C>
  117803B                             3 May 1999                         USD 150,000,000

  120692B                             4 May 1999                          USD 75,000,000

  118204B                             4 May 1999                         USD 125,000,000

  154404B                             30 March 2000                      EUR 250,000,000
</TABLE>

                                     - 9 -

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