Document:

<PAGE>

                                                                     Exhibit 4.5

                          ACT TELECONFERENCING, INC.
                            2000 STOCK OPTION PLAN

                     Non-Statutory Stock Option Agreement
                     ------------------------------------
                                  (Employee)

================================================================================
Name of Optionee:
================================================================================
No. of Shares Covered:                         Date of Grant:
--------------------------------------------------------------------------------
Exercise Price Per Share:                      Expiration Date:
--------------------------------------------------------------------------------
Exercise Schedule (Cumulative):

        Date(s) of                                  No. of Shares as to Which
      Exercisability                                Option Becomes Exercisable
      --------------                                --------------------------

================================================================================

     This Non-Statutory Stock Option Agreement ("Agreement") between ACT
Teleconferencing, Inc., a Colorado corporation (the "Company"), and the optionee
identified above (the "Optionee") is effective as of the date of grant specified
above.

                                   Recitals
                                   --------

     WHEREAS, the Company maintains the ACT Teleconferencing, Inc. 2000 Stock
Option Plan (the "Plan"); and

     WHEREAS, pursuant to the Plan, the Board of Directors of the Company (the
"Board") or a committee of two or more directors of the Company (the
"Committee") appointed by the Board administers the Plan and has the authority
to determine the awards to be granted under the Plan (if the Board has not
appointed a committee to administer the Plan, then the Board shall constitute
the Committee); and

     WHEREAS, the Committee has determined that the Optionee is eligible to
receive an award under the Plan in the form of a non-statutory stock option (the
"Option");
<PAGE>

     NOW, THEREFORE, the Company hereby grants this Option to the Optionee under
the terms and conditions as follows.

                             Terms and Conditions*
                             --------------------

1.   Grant. The Optionee is granted this Option to purchase the number of Shares
     -----
     specified at the beginning of this Agreement.

2.   Exercise Price.  The price to the Optionee of each Share subject to this
     --------------
     Option shall be the exercise price specified at the beginning of this
     Agreement.

3.   Non-Statutory Stock Option.  This Option is not intended to be an
     --------------------------                  ---
     "incentive stock option" within the meaning of Section 422 of the Internal
     Revenue Code of 1986, as amended (the "Code").

4.   Exercise Schedule.  This Option shall vest and become exercisable as to the
     -----------------
     number of Shares and on the dates specified in the exercise schedule at the
     beginning of this Agreement.  The exercise schedule shall be cumulative;
     thus, to the extent this Option has not already been exercised and has not
     expired, terminated or been cancelled, the Optionee or the person otherwise
     entitled to exercise this Option as provided herein may at any time, and
     from time to time, purchase all or any portion of the Shares then
     purchasable under the exercise schedule.

     This Option may also be exercised in full (notwithstanding the exercise
     schedule) under the circumstances described in Section 8 of this Agreement
     if it has not expired prior thereto.

5.   Expiration.  This Option shall expire at 5:00 p.m. Denver, Colorado time on
     ----------
     the earliest of:

     (a)  The expiration date specified at the beginning of this Agreement
          (which date shall not be later than ten years after the date of
          grant);

     (b)  The last day of the period following the termination of employment of
          the Optionee during which this Option can be exercised (as specified
          in Section 7 of this Agreement); or

     (c)  The date (if any) fixed for cancellation pursuant to Section 8 of this
          Agreement.

     In no event may anyone exercise this Option, in whole or in part, after it
     has expired, notwithstanding any other provision of this Agreement.

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

*    Unless the context indicates otherwise, terms that are not defined in this
Agreement shall have the meaning set forth in the Plan as it currently exists or
as it is amended in the future.

<PAGE>

6.   Procedure to Exercise Option.
     ----------------------------

     Notice of Exercise. This Option may be exercised by delivering written
     notice of exercise to the Company at the principal executive office of the
     Company, to the attention of the Company's Secretary, in the form attached
     to this Agreement. The notice shall state the number of Shares to be
     purchased, and shall be signed by the person exercising this Option. If the
     person exercising this Option is not the Optionee, he/she also must submit
     appropriate proof of his/her right to exercise this Option.

     Tender of Payment. Upon giving notice of any exercise hereunder, the
     Optionee shall provide for payment of the purchase price of the Shares
     being purchased through one or a combination of the following methods:

          (a)  Cash;

          (b)  Cancellation of indebtedness;

          (c)  By delivery to the Company of unencumbered Shares having an
          aggregate Fair Market Value (as defined in paragraph 7 of the Plan) on
          the date of exercise equal to the purchase price of such Shares;

          (d)  By a reduction in the number of Shares delivered to the Optionee
          upon exercise, such number of Shares having an aggregate Fair Market
          Value on the date of exercise equal to the purchase price of such
          Shares; or

          (e)  To the extent permitted by law, a broker-assisted cashless
          exercise in which the Optionee irrevocably instructs a broker to
          deliver proceeds of a sale of all or a portion of the Shares to be
          issued pursuant to the exercise to the Company in payment of the
          purchase price of such Shares.

     Notwithstanding the foregoing, the Optionee shall not be permitted to pay
     any portion of the purchase price with Shares if the Committee, in its sole
     discretion, determines that payment in such manner is undesirable.

     Delivery of Certificates. As soon as practicable after the Company receives
     the notice and purchase price provided for above, it shall deliver to the
     person exercising this Option, in the name of such person, a certificate or
     certificates representing the Shares being purchased. The Company shall pay
     any original issue or transfer taxes with respect to the issue or transfer
     of the Shares and all fees and expenses incurred by it in connection
     therewith. All Shares so issued shall be fully paid and nonassessable.
     Notwithstanding anything to the contrary in this Agreement, the Company
     shall not be required to issue or deliver any Shares prior to the
     completion of such registration or other qualification of such Shares under
     any state or federal law, rule or regulation as the Company shall determine
     to be necessary or desirable.
<PAGE>

7.   Employment Requirement.  This Option may be exercised only while the
     ----------------------
     Optionee remains employed with the Company or a parent or subsidiary
     thereof, and only if the Optionee has been continuously so employed since
     the date of this Agreement; provided that:

     (a)  This Option may be exercised for three months following the day the
          Optionee's employment by the Company ceases if such cessation of
          employment is for a reason other than death or disability, but only to
          the extent that it was exercisable immediately prior to termination of
          employment.

     (b)  This Option may be exercised within one year after the Optionee's
          employment by the Company ceases if such cessation of employment is
          because of death or disability.

     (c)  If the Optionee's employment terminates after a declaration made
          pursuant to Section 8 of this Agreement in connection with an Event,
          this Option may be exercised at any time permitted by such
          declaration.

     Notwithstanding the above, this Option may not be exercised after it has
     expired.

8.   Acceleration of Option.
     ----------------------

     Death or Disability.  This Option may be exercised in full, regardless of
     whether such exercise occurs prior to a date on which this Option would
     otherwise vest, upon the death or disability of the Optionee; provided that
     the Optionee shall have been continuously employed by the Company or a
     parent or subsidiary thereof between the date of this Agreement and the
     date of such death or disability.

     Change in Control. In the event of a Change in Control as defined in
     paragraph 11 of the Plan, then, without any action by the Committee or the
     Board, this Option, to the extent not already exercised in full or
     otherwise terminated, expired or canceled, shall become immediately
     exercisable in full and the Committee may, as provided in paragraph 11(c)
     of the Plan, determine that this option shall be canceled and make certain
     cash payments with respect to this Option.

     Event. In the event of an Event as defined in paragraph 12 of the Plan, the
     Committee may, but shall not be obligated to:

     (a)  if the Event is a merger or consolidation or statutory share exchange,
          make appropriate provision for the protection of this Option by the
          substitution for this Option of options or voting common stock of the
          corporation surviving any merger or consolidation or, if appropriate,
          the parent corporation of the Company or such surviving corporation,
          as provided in paragraph 12 of the Plan; or

<PAGE>

     (b)  at least 20 days prior to the occurrence of the Event, declare, and
          provide written notice to the Optionee of the declaration, that this
          Option, whether or not then exercisable, shall be canceled at the time
          of, or immediately prior to the occurrence of, the Event (unless it
          shall have been exercised prior to the occurrence of the Event).  In
          connection with any such declaration, the Committee may, but shall not
          be obligated to, cause payment to be made to the Optionee of cash
          equal to, for each Share covered by the canceled Option, the amount,
          if any, by which the Event Proceeds per Share, as defined in paragraph
          12 of the Plan, exceeds the exercise price per Share covered by this
          Option.  At the time of any such declaration, this Option shall
          immediately become exercisable in full and the Optionee shall have the
          right, during the period preceding the time of cancellation of this
          Option, to exercise this Option as to all or any part of the Shares
          covered by this Option.  In the event of a declaration pursuant to
          this subsection, to the extent this Option has not been exercised
          prior to the Event, the unexercised part of this Option shall be
          canceled at the time of, or immediately prior to, the Event, as
          provided in the declaration.  Notwithstanding the foregoing, the
          holder of this Option shall not be entitled to the payment provided
          for in this subsection if this Option shall have expired pursuant to
          Section 5 above.

     Discretionary Acceleration.  The Committee has the power, in its sole
     discretion, to declare at any time that this Option shall be immediately
     exercisable.

9.   Limitation on Transfer.  While the Optionee is alive, only the Optionee or
     ----------------------
     his/her guardian or legal representative may exercise this Option.  This
     Option may not be assigned or transferred other than by will or the laws of
     descent and distribution or pursuant to a qualified domestic relations
     order as defined by the Code or Title I of the Employee Retirement Income
     Security Act, or the rules thereunder.

10.  No Shareholder Rights Before Exercise.  No person shall have any of the
     -------------------------------------
     rights of a shareholder of the Company with respect to any Share subject to
     this Option until the Share actually is issued to him/her upon exercise of
     this Option.

11.  Discretionary Adjustment.  In the event of any reorganization, merger,
     ------------------------
     consolidation, recapitalization, liquidation, reclassification, stock
     dividend, stock split, combination of shares, rights offering, or
     extraordinary dividend or divestiture (including a spin-off), or any other
     change in the corporate structure or Shares of the Company, the Committee
     (or if the Company does not survive any such transaction, a comparable
     committee of the Board of Directors of the surviving corporation) may,
     without the consent of the Optionee, make such adjustment as it determines
     in its discretion to be appropriate as to the number and kind of securities
     subject to and reserved under the Plan and, in order to prevent dilution or
     enlargement of rights of the Optionee, the number and kind of securities
     issuable upon exercise of this Option and the exercise price hereof.

<PAGE>

12.  Tax Withholding.  Delivery of Shares upon exercise of this Option shall be
     ---------------
     subject to any required withholding taxes.  As a condition precedent to
     receiving Shares upon exercise of this Option, the Optionee may be required
     to pay to the Company, in accordance with the provisions of paragraph 9 of
     the Plan, an amount equal to the amount of any required withholdings.

13.  Interpretation of This Agreement.  All decisions and interpretations made
     --------------------------------
     by the Committee with regard to any question arising hereunder or under the
     Plan shall be binding and conclusive upon the Company and the Optionee.  If
     there is any inconsistency between the provisions of this Agreement and the
     Plan, the provisions of the Plan shall govern.

14.  Discontinuance of Employment.  This Agreement shall not give the Optionee a
     ----------------------------
     right to continued employment with the Company or any parent or subsidiary
     of the Company, and the Company or any such parent or subsidiary employing
     the Optionee may terminate his/her employment at any time and otherwise
     deal with the Optionee without regard to the effect it may have upon
     him/her under this Agreement.

15.  Option Subject to Plan, Articles of Incorporation and Bylaws.  The Optionee
     ------------------------------------------------------------
     acknowledges that this Option and the exercise thereof is subject to the
     Plan, the Articles of Incorporation, as amended from time to time, and the
     Bylaws, as amended from time to time, of the Company, and any applicable
     federal or state laws, rules or regulations.

16.  Obligation to Reserve Sufficient Shares.  The Company shall at all times
     ---------------------------------------
     during the term of this Option reserve and keep available a sufficient
     number of Shares to satisfy this Agreement.

17.  Binding Effect.  This Agreement shall be binding in all respects on the
     --------------
     heirs, representatives, successors and assigns of the Optionee.

18.  Choice of Law.  This Agreement is entered into under the laws of the State
     -------------
     of Colorado and shall be construed and interpreted thereunder (without
     regard to its conflict of law principles).

<PAGE>

IN WITNESS WHEREOF, the Optionee and the Company have executed this Agreement as
of the ____ day of ________, 20__.

                              OPTIONEE

                              _______________________________________

                              ACT TELECONFERENCING, INC.

                              By_____________________________________
                                Its__________________________________

<PAGE>

                                    __________________, 20___

                                    Notice of Option Exercise
                                    -------------------------

ACT TELECONFERENCING, INC.
1658 Cole Boulevard
Suite 130
Golden, CO 80401
Attention:  Chief Financial Officer

Sir/Madam:

     I hereby exercise the following option (the "Option") granted to me under
the ACT Teleconferencing, Inc. 2000 Stock Option Plan (the "Plan") with respect
to the number of shares of Common Stock, no par value ("Shares"), of ACT
Teleconferencing, Inc. (the "Company"), indicated below:

          Name:
                                           -----------------------------------

          Date of Grant of Option:
                                           -----------------------------------

          Exercise Price Per Share:
                                           -----------------------------------

          Number of Shares With Respect to
          Which the Option is Hereby
          Exercised:
                                           -----------------------------------

          Total Exercise Price:
                                           -----------------------------------

     [ ]  Enclosed with this letter is a check, bank draft or money
          order in the amount of the Total Exercise Price.

     [ ]  I hereby agree to pay the Total Exercise Price by
          cancellation of a debt owed to me by the Company.

     [ ]  I hereby agree to pay the Total Exercise Price within five business
          days of the date hereof and, as stated in the attached Broker's
          Letter, I have delivered irrevocable instructions to
          __________________________________ to promptly deliver to the Company
          the amount of sale or loan proceeds from the Shares to be issued
          pursuant to this exercise necessary to satisfy my obligation hereunder
          to pay the Total Exercise Price.

     [ ]  Enclosed with this letter is a certificate evidencing
          unencumbered Shares (duly

<PAGE>

          endorsed in blank) having an aggregate Fair Market Value (as defined
          in the Plan) equal to or in excess of the Total Exercise Price.

     [ ]  I elect to pay the Total Exercise Price through a reduction in the
          number of Shares delivered to me upon this exercise of the Option as
          provided in paragraph 8 of the Plan.

     If I am enclosing Shares with this letter, I hereby represent and warrant
that I am the owner of such Shares free and clear of all liens, security
interests and other restrictions or encumbrances. I agree that I will pay any
required withholding taxes in connection with this exercise as provided in
paragraph 9 of the Plan.

     Please issue a certificate (the "Certificate") for the number of Shares
with respect to which the Option is being exercised in the name of the person
indicated below and deliver the Certificate to the address indicated below:

          Name in Which to Issue Certificate:  ______________________________

          Address to Which Certificate
          Should be Delivered:                 ______________________________

          Principal Mailing Address
          for Holder of the Certificate (if    ______________________________
          different from above):

                                               Very truly yours,

                                               ______________________________
                                               Signature

                                               ______________________________
                                               Name, please print

                                               ______________________________
                                               Social Security Number

                                      -2-
<PAGE>

                                                 __________________, 20___

                                                 Broker Assisted Option Exercise
                                                 -------------------------------

ACT TELECONFERENCING, INC.
1658 Cole Boulevard
Suite 130
Attention:  Chief Financial Officer

Sir/Madam:

          Name of Optionee:
                                                    ---------------------------

          Date of Grant of Option:
                                                    ---------------------------

          Exercise Price Per Share:
                                                    ---------------------------

          Number of Shares With Respect to
          Which the Option is to be Exercised:
                                                    ---------------------------

          Total Exercise Price:
                                                    ---------------------------

     The above Optionee has requested that we finance the exercise of the above
Option to purchase Shares of common stock of ACT Teleconferencing, Inc. (the
"Company") and has given us irrevocable instructions to promptly deliver to the
Company the amount of sale or loan proceeds from the Shares to be issued
pursuant to such exercise to satisfy the Optionee's obligation to pay the Total
Exercise Price.

                                                    Very truly yours,

                                                    ___________________________
                                                    Broker Name

                                                    By_________________________<PAGE>

                                                                   EXHIBIT 10.52

                   SECOND AMENDMENT TO EMPLOYMENT AGREEMENT
                                      AND
                     AMENDMENT TO STOCK OPTION AGREEMENTS

     This Second Amendment to Employment Agreement dated as of September 11,
2000 (hereinafter referred to as "Amendment"), is by and between FirstWorld
                                  ---------
Communications, Inc., a Delaware corporation (the "Company") and Paul C. Adams
                                                   -------
("Executive") (collectively, the "Parties").
  ---------                       -------

                                   RECITALS

     A.   The Parties have previously entered into an Employment Agreement dated
          as of January 21, 1999, which was amended pursuant to a First
          Amendment to Employment Agreement dated as of January 27, 2000 (both
          of which are hereinafter referred to as "Employment Agreement").
                                                   --------------------

     B.   The Parties have previously entered into the Employee Stock Option
          Agreements dated April 15, 1999 and December 31, 1999, (hereinafter
          collectively referred to as "Prior Option Agreements").
                                       ------------------------

     C.   Pursuant to the terms of following amendments, the Parties mutually
          desire to: 1) extend the period of employment of Executive through and
          including August 31, 2001 under the same terms and conditions as
          contained in the Employment Agreement; 2) grant additional options,
          and under certain circumstances provide for a longer period in which
          to exercise options; and 3) increase in the Executive's bonus
          opportunity.

                                   AGREEMENT

     IN CONSIDERATION of the foregoing, the mutual covenants contained herein
and other good and valuable consideration, the sufficiency of which is hereby
acknowledged, the Parties hereby agree to amend the Employment Agreement as
follows:

     1.   Section 2 Term of the Employment Agreement is deleted in its entirety
                    ----
and amended to read as follows:

          Term.  The period of employment of Executive by Company hereunder (the
          ----
          "Employment Period") shall commence on January 21, 1999 (the

          "Commencement Date") and shall continue through August 31, 2001.  The
          ------------------
          Employment Period may be sooner terminated by either party in
          accordance with Section 5 of this Agreement.

     2.   Section 4(b) Annual Bonus of the Employment Agreement is deleted in
                       ------------
its entirety and amended to read as follows:

          Annual Bonus.  The Board's Compensation Committee (the "Compensation
                                                                  ------------
          Committee") or its delegate shall review Executive's performance at
          ---------
          least once quarterly during each year of the Employment Period to
          review the Executive's performance pursuant to the procedures and
          terms of Company's Quarterly Bonus Plan ("Bonus Plan"), as in effect
          from time to time.  The percentage of Executive's Salary to be used
          for calculations under the Bonus Plan shall be an amount equal to 50%
          of the Executive's Base Salary.  The Executive's Bonus shall be paid
          pursuant to the terms and conditions of the Bonus Plan.

                                       1
<PAGE>

     3.   Additional Grant of Stock Options ("New Option Agreement"):
                                              --------------------

          Effective as of the date of this Amendment ("Option Grant Date"),
                                                       -----------------
          Executive shall be awarded a stock option (the "Stock Option") to
                                                          ------------
          purchase Thirty-Five Thousand (35,000) shares of the Company's Series
          B Common Stock, par value $.0001 per share (the "Common Stock").  The
                                                           ------------
          shares of Common Stock subject to the Stock Option shall vest in
          increments of Fourteen Thousand (14,000) shares on August 1, 2001; Ten
          Thousand Five Hundred (10,500) shares August 1, 2002; and Ten Thousand
          Five Hundred (10,500) shares on August 1, 2003.  The Purchase Price
          for the Common Stock covered by the Option shall be equal to the fair
          market value of the Common Stock as measured by the closing price of a
          share of Common Stock on NASDAQ on the trading date of the Option
          Grant Date.  The Stock Option will be granted under the 1999 Equity
          Incentive Plan of FirstWorld Communications, Inc. (the "Plan") and the
                                                                  ----
          terms and conditions of the Stock Option will be determined in
          accordance with the Plan; provided however, to the extent such terms
          of the Plan or the New Option Agreement conflict with the terms of the
          Employment Agreement, as amended, the terms of the Employment
          Agreement will control.  To the extent permissible under applicable
          law and the Plan, the Stock Option granted under the New Option
          Agreement will be granted as incentive stock options.

     4.   Consistent with Section 4(c) Stock Options of Executive's Employment
                                       -------------
Agreement, Section 5.3 Change in Control of the Prior Option Agreements shall
                       -----------------
read as follows:

          Change in Control.  Notwithstanding any terms in the Plan to the
          -----------------
          contrary, this Option Agreement, the Employment Agreement, as amended,
          or otherwise, all of the Options granted hereunder shall become vested
          and exercisable immediately prior to such transaction in the event of
          the sale of all or substantially all of the Company's assets or a
          merger or consolidation in which the Company is not the surviving
          entity, or the Company's stockholders prior to the transaction own
          less than 50% of the voting power of the Company's outstanding
          securities immediately following the transaction.

     5.   Section 5.3 of the New Option Agreement shall read as follows:

          Change in Control and Accelerated Vesting.  Notwithstanding any terms
          -----------------------------------------
          in the Plan to the contrary, this Option Agreement, the Employment
          Agreement, as amended, or otherwise, all of the Options granted
          hereunder shall become vested and exercisable immediately prior to
          such transaction in the event of the sale of all or substantially all
          of the Company's assets or a merger or consolidation in which the
          Company is not the surviving entity, or the Company's stockholders
          prior to the transaction own less than 50% of the voting power of the
          Company's outstanding securities immediately following the
          transaction.  In addition, upon termination of Executive's employment
          by the Company without Cause or by the Executive for Good Reason prior
          to the expiration of the Employment Period, those Options granted
          hereunder that would otherwise become vested on or before August 31,
          2001 shall become vested and exercisable.

     6.   Section 3.3(c) Expiration of Option of the Prior Option Agreements
                         --------------------
shall read as follows:

          If the Optionee's employment is terminated by the Company without
          Cause or by the Optionee for Good Reason, pursuant to Optionee's
          Employment Agreement, as amended, the expiration of the later to occur
          of: (i) August 31, 2001, or (ii) thirty (30) days from the Date of
          Termination of Employment.

                                       2
<PAGE>

     Executive understands that amending the Prior Option Agreements to extend
the opportunity to exercise the Options may adversely affect his tax
consequences under such Prior Option Agreements.

     7.   Section 3.3(c) Expiration of Option of the New Option Agreement shall
                         --------------------
read as follows:

          If the Optionee's employment is terminated by the Company without
          Cause or by the Optionee for Good Reason, pursuant to Optionee's
          Employment Agreement, as amended, the expiration of the later to occur
          of: (i) August 31, 2001, or (ii) ninety (90) days from the Date of
          Termination of Employment.

     8.   Section 12 Notice of the Employment Agreement is amended to read as
                     ------
follows:

          Notice.  For the purposes of this Agreement, notices, demands and all
          ------
          other communications provided for in this Agreement shall be in
          writing and shall be deemed to have been duly given when delivered
          either personally or by United States certified or registered mail,
          return receipt requested, postage prepaid, addressed as follows:

          If to Executive:    Paul C. Adams
                              1541 Valley View Court
                              Golden, CO  80403

          If to the Company:  FirstWorld Communications, Inc.
                              8390 East Crescent Parkway, Suite 300
                              Greenwood Village, CO  80111
                              Attn: General Counsel
                              Facsimile: (303) 874-2461

          or to such other address as any party may have furnished to the others
          in writing in accordance herewith, except that notices of change of
          address shall be effective only upon receipt.

     9.   Executive acknowledges that he may be employed by a subsidiary of the
Company, however, the Company will remain liable for all obligations contained
in the Employment Agreement.

     10.  The Employment Agreement and the Prior Option Agreements are deemed
amended to reflect the changes contemplated by this Amendment. Except as
expressly modified herein, the Employment Agreement and Prior Option Agreements
shall remain in full force and effect in accordance with their terms and
conditions.

     11.  Capitalized terms in this Amendment that are not otherwise defined
herein shall have the same meaning as in the Employment Agreement, the Prior
Option Agreements or the New Option Agreement.

     12.  The Parties agree to execute, deliver and amend such documents as are
reasonably necessary accomplish the Parties' intent hereunder.

                                       3
<PAGE>

     IN WITNESS WHEREOF, the Parties hereto have executed this Amendment on the
date first above written.

FIRSTWORLD COMMUNICATIONS, INC.,
a Delaware corporation

By:  /s/ David J. Gandini                    /s/ Paul C. Adams
     --------------------------              ------------------------
Name:  David J. Gandini                      Paul C. Adams
Title: Executive Vice President and
       Acting Chief Operating Officer

                                       4

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