Document:

<PAGE>   1
                                                                  EXHIBIT 10.58

                              AFFIRMATION AGREEMENT

     This Affirmation Agreement ("Agreement") is entered into as of September
20, 2000 by American Mutual Holding Company, an Iowa stock company and survivor
of a merger with AmerUs Life Holdings, Inc. ("the Reorganized Company"), in
favor of the Agent and the Lenders (as hereinafter defined) under the Facility
Agreement referenced below.

                               W I T N E S S E T H

     WHEREAS, AmerUs Life Holdings, Inc., an Iowa corporation ("AmerUs Life"),
Bank One, NA (f/k/a The First National Bank of Chicago), individually and as
Agent ("Agent"), and the other financial institutions signatory thereto (the
"Lenders") are parties to that certain $27,500,000 Facility and Guaranty
Agreement dated as of February 12, 1999 (as previously amended, the "Facility
Agreement").

     WHEREAS, substantially contemporaneously herewith, AmerUs Life is merging
with and into the Reorganized Company, which is the surviving corporation in
such merger (the "Merger").

     NOW, THEREFORE, as an inducement to the Lenders to have the "Delayed
Amendments" under Amendment No. 2 to the Facility Agreement become effective as
of the consummation of the Merger, the Reorganized Company, in its capacity as
successor by merger to AmerUs Life, hereby acknowledges that it is the "Company"
under the Facility Agreement and hereby assumes and agrees to pay and perform
all Obligations of the Company under the Facility Agreement and the other Loan
Documents (as defined in the Facility Agreement).

     IN WITNESS WHEREOF, the undersigned has executed this Agreement as of the
date written above.

                                    AMERICAN MUTUAL HOLDING COMPANY
                                    By:  /s/ Roger K. Brooks
                                         --------------------------------------

                                    Name:   Roger K. Brooks
                                    Title:  Chairman, President and
                                            Chief Executive Officer<PAGE>   1

                                                                  EXHIBIT 10.59

                                    AMENDMENT

     1. Reference is made to (a) that certain Facility and Guaranty Agreement
(the "Facility Agreement") dated as of February 12, 1999 among AmerUs Life
Holdings, Inc. ("ALHI"), Bank One, NA (f/k/a The First National Bank of Chicago)
individually ("Bank One") and as agent (the "Agent") and (b) that certain
Amendment No. 2 to Facility Agreement dated as of January 25, 2000 by and among
the ALHI, the Agent and Bank One ("Amendment No. 2").

     2. ALHI has merged into American Mutual Holding Co., which has changed its
name to AmerUs Group Co. AmerUs Group Co., successor to ALHI, is referred to
herein as the "Company".

     3. The Company, the Agent and Bank One (being the sole "Lender" under the
Facility Agreement) hereby agree that Amendment No. 2 is hereby amended by
deleting the reference to "August 31, 2000" in the last paragraph of Section 3
thereof and replacing it with a reference to "October 31, 2000".

     4. Bank One waives as of the date of the Merger (as defined in Amendment
No. 2) any Program Event of Default or Unmatured Default under the Facility
Agreement which would not have existed had the Delayed Effective Date occurred
contemporaneously with the Merger (as defined in Amendment No. 2).

     5. This Amendment shall be construed in accordance with the internal laws
(including, without limitation, 735 ILCS Section 105/5-1 et seq, but otherwise
without regard to the conflict of laws provisions) of the State of Illinois, but
giving effect to federal laws applicable to national banks.

     6. This Amendment may be executed in any number of counterparts, each of
which when so executed shall be deemed an original but all such counterparts
shall constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties have executed this Amendment as of the 20th
day of September, 2000.

                            AMERUS GROUP CO.

                            By:    /s/ Michael G. Fraizer
                                   --------------------------------------------
                            Name:  Michael G. Fraizer
                            Title: Executive Vice President and
                                   Chief Financial Officer

                            BANK ONE, NA,
                            Individually and as Agent

                            By:    /s/ Cynthia Priest
                                   --------------------------------------------
                            Name:  Cynthia Priest
                            Title: First Vice President<PAGE>   1

                                                                  EXHIBIT 10.60

                     ACKNOWLEDGMENT AND ASSUMPTION AGREEMENT

     ACKNOWLEDGMENT AND ASSUMPTION AGREEMENT (the "Agreement"), dated as of
September 20, 2000 among American Mutual Holding Company ("AMHC"), an Iowa
corporation, and The Chase Manhattan Bank, as Administrative Agent for the
Banks. Unless otherwise defined herein, all capitalized terms used herein and
defined in the Credit Agreement referred to below are used herein as therein
defined.

                              W I T N E S S E T H:
                               - - - - - - - - - -

     WHEREAS, AmerUs Life Holdings, Inc. ("ALH"), an Iowa corporation, the
lending institutions from time to time party thereto (the "Banks") and The Chase
Manhattan Bank, as Administrative Agent (together with the Banks, the "Bank
Creditors"), have entered into a Credit Agreement, dated as of October 23, 1997
(as amended, modified or supplemented from time to time, the "Credit Agreement")
providing for the making of Loans to the Borrower referred to therein, all as
contemplated therein;

     WHEREAS, ALH has consummated a transaction pursuant to which ALH and AMHC
have merged (the "Merger") on the terms and conditions contained in Section
7.02(j) of the Credit Agreement, with AMHC as the surviving entity of the
Merger;

     WHEREAS, subject to the terms and conditions set forth below, the parties
hereto desire that AMHC expressly assume all of the Borrower's rights,
obligations, duties and liabilities under (i) the Credit Agreement, (ii) the
Notes and (iii) each other Credit Document;

     NOW, THEREFORE, it is agreed:

     1. AMHC hereby expressly assumes all rights, obligations, duties and
liabilities of the Borrower under the Credit Agreement, the Notes issued
thereunder and the other Credit Documents.

     2. Upon the effectiveness of this Agreement, all references in the Credit
Agreement to the "Borrower" shall be deemed to be references to AMHC.

     3. To induce the Administrative Agent to enter into this Agreement, AMHC
hereby represents, warrants and agrees as follows:

<PAGE>   2

     a) on the date hereof and after giving effect to AMHC's execution and
  delivery of this Agreement, all representations and warranties contained in
  each of the Credit Documents are true and correct in all material respects
  and no Default or Event of Default is in existence;

     b) on and after the date hereof, AMHC will fully and faithfully
  perform all obligations (including payment obligations and compliance with
  all covenants) of the "Borrower" under the Credit Agreement and the Notes
  delivered pursuant thereto and will fully and faithfully perform all of its
  obligations under any other Credit Documents executed and delivered by it
  or the Borrower; and

     c) all conditions set forth in Section 7.02(j) of the Credit Agreement have
  been satisfied.

     4. This Agreement shall become effective as of the date first above
written, when each of the parties hereto shall have executed a copy hereof and
shall have delivered the same to the Administrative Agent.

     5. This Agreement may be executed in any number of counterparts and by the
different parties hereto on separate counterparts, each of which when so
executed and delivered shall be an original, but all of which shall constitute
one and the same instrument. A complete set of counterparts shall be lodged with
AMHC and the Administrative Agent.

     6. THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER
SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW OF THE STATE OF
NEW YORK WITHOUT GIVING EFFECT TO THE CONFLICT OF LAW PRINCIPLES THEREOF.

                                      -2-

<PAGE>   3

     IN WITNESS WHEREOF, each of the parties hereto has caused a counterpart of
this Agreement to be duly executed and delivered as the date first above
written.

                            AMERICAN MUTUAL HOLDING COMPANY

                            By: /s/ Roger K. Brooks
                                -----------------------------------------------
                                Name:   Roger K. Brooks
                                Title:  Chairman, President and
                                        Chief  Executive Officer

                            THE CHASE MANHATTAN BANK, as Administrative Agent

                            By: /s/ Helen L. Newcomb
                                -----------------------------------------------
                                Name:   Helen L. Newcomb
                                Title:  Vice President

                                      -3-<PAGE>   1
                                                                    EXHIBIT 10.3

                               FIRST AMENDMENT TO
                           SECOND AMENDED AND RESTATED
                        AGREEMENT OF LIMITED PARTNERSHIP
                      OF EOP OPERATING LIMITED PARTNERSHIP

     THIS FIRST AMENDMENT TO SECOND AMENDED AND RESTATED AGREEMENT OF LIMITED
PARTNERSHIP OF EOP OPERATING LIMITED PARTNERSHIP (this "AMENDMENT"), dated
August 21, 2000, is entered into by EQUITY OFFICE PROPERTIES TRUST, a Maryland
real estate investment trust, as the general partner (the "GENERAL PARTNER") of
EOP Operating Limited Partnership, a Delaware limited partnership (the
"PARTNERSHIP"), for itself and on behalf of itself and the Limited Partners of
the Partnership, and those persons whose signatures are set forth on the
signature pages attached hereto.

     WHEREAS, on the date hereof, NORTH LOOP-TREMONT PARTNERSHIP, an Illinois
partnership ("CONTRIBUTOR"), is receiving 94,106 Class B Units of limited
partnership interest in the Partnership ("OP UNITS") in exchange for its limited
partnership interest in ECH-North Loop/Theater District Parking Limited
Partnership ("ECHNLT"), pursuant to a closing under, and as more particularly
described in, that certain Contribution Agreement (the "CONTRIBUTION AGREEMENT")
dated November 6, 1997, by and between the Contributor, the Partnership,
ECH-Chicago Parking Limited Partnership ("ECH") and the constituent partners of
Contributor (the "CONSTITUENT PARTNERS") and that certain Settlement Agreement
and Release of Claims by and between the Partnership, ECH, Contributor and the
Constituent Partners;

     WHEREAS, the principal assets of ECHNLT are the parking garages
(collectively, the "PROPERTIES") commonly known as: (i) the Theater District
Self Park, Chicago, Illinois ("TD SELF PARK"); and (ii) the North Loop
Transportation Center, Chicago, Illinois ("NLTC");

     WHEREAS, pursuant to the authority granted to the General Partner under the
Second Amended and Restated Agreement of Limited Partnership of EOP Operating
Limited Partnership dated as of June 19, 2000, (the "PARTNERSHIP AGREEMENT"),
the General Partner desires to amend the Partnership Agreement to reflect (i)
the admission of the Contributor as an Additional Limited Partner and the holder
of the OP Units and (ii) the agreements by and among the Partnership and the
Contributor as to certain other matters set forth on Exhibit B to this
Amendment; and

     WHEREAS, the Contributor desires to become a party to the Partnership
Agreement and to be bound by all of the terms, conditions and other provisions
of this Amendment, the Exhibits hereto, and the Partnership Agreement;

     NOW, THEREFORE, in consideration of the premises set forth above and for
other good and valuable consideration, the receipt and sufficiency of which
hereby are acknowledged, the General Partner hereby amends the Partnership
Agreement as follows:

<PAGE>   2

     1.  RESTATEMENT OF EXHIBIT A. Exhibit A to the Partnership Agreement hereby
is amended to reflect the admission of Contributor as an Additional Limited
Partner to the Partnership hereby. Exhibit "A" attached to this Amendment
contains the name, address, Capital Account, number of Partnership Units and
Percentage Interest of Contributor and shall be deemed attached to, and an
addendum of, Exhibit A to the Partnership Agreement for all relevant purposes.

     2.  AMENDMENT AND RESTATEMENT OF EXHIBIT E. Exhibit E to the Partnership
Agreement is hereby amended by attaching and adding Exhibit B to this Amendment,
which sets forth specific agreements regarding certain additional rights and
obligations of the Contributor, as Exhibit E-7 to the Partnership Agreement.
Further, Exhibit E to the Partnership Agreement shall be restated to designate
Contributor as a Part II Protected Partner. Exhibit E shall be further amended
by adding the following new explanatory note, which shall appear as an
annotation to Part II Protected Partner added to such Exhibit E pursuant to the
preceding sentence of this paragraph 2:

         (7)  Protected Amount is as provided for in Exhibit E-7.

     3.  REPRESENTATIONS AND WARRANTIES. The General Partner hereby represents
and warrants to Contributor that the General Partner has the authority to
execute and enter into this Amendment without obtaining the consent of the
Limited Partners.

     4.  DEFINED TERMS. All capitalized terms used in this Amendment and not
otherwise defined shall have the meanings assigned to them in the Partnership
Agreement. Except as modified herein, all terms and conditions of the
Partnership Agreement shall remain in full force and effect, which terms and
conditions the General Partner hereby ratifies and affirms.

     5.  TIME IS OF THE ESSENCE. Time is of the essence of each and every
provision of this Amendment.

         IN WITNESS WHEREOF, the undersigned has executed this Amendment as of
the date first set forth above.

                                 EQUITY OFFICE PROPERTIES TRUST, a
                                 Maryland real estate investment
                                 trust, the General Partner of EOP
                                 Operating Limited Partnership and on
                                 behalf of existing Limited Partners

                                 By: /s/ Laura Gerard Hassan
                                     ------------------------------------------
                                 Name:   Laura Gerard Hassan
                                       ----------------------------------------
                                 Title:  Vice President
                                        ---------------------------------------

                                        2

<PAGE>   3

                                 CONTRIBUTOR:

                                 NORTH LOOP-TREMONT PARTNERSHIP, an Illinois
                                 partnership

                                 By:  North Loop Transportation Center Limited
                                      Partnership, an Illinois limited
                                      partnership, as a Constituent Partner

                                 By:  Richard A. Stein Development Company,
                                      Inc., an Illinois corporation, as its
                                      general partner and individually in its
                                      capacity as a Constituent Partner

                                      By: /s/ Richard A. Stein
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                 By:  Ruvir Corporation, a California
                                      corporation, as its general partner and
                                      individually in its capacity as a
                                      Constituent Partner

                                      By: /s/ G. Richard Katzenbach
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                 By:  Myron C. Warshauer Development Company,
                                      Inc. an Illinois corporation, as its
                                      general partner and individually in its
                                      capacity as a Constituent Partner

                                      By: /s/ Myron C. Warshauer
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                 By:  Bronco Ltd., a California limited
                                      partnership, as its limited partner and
                                      individually in its capacity as a
                                      Constituent Partner

                                      By: /s/ G. Richard Katzenbach
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                       3
<PAGE>   4

                                      By: /s/ Myron C. Warshauer
                                          -------------------------------------
                                          Myron C. Warshauer, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                      By: /s/ Richard A. Stein
                                          -------------------------------------
                                          Richard A. Stein, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                      By: /s/ Richard A. Hanson
                                          -------------------------------------
                                          Richard A. Hanson, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                      By:  Tremont Theatre Row Partnership, an
                                           Illinois limited partnership, as a
                                           partner and individually in its
                                           capacity as a Constituent Partner

                                      By: Stein & Company Theatre District
                                          Self-Park, Inc., an Illinois
                                          corporation, as its general partner
                                          and individually in its capacity as a
                                          Constituent Partner

                                      By: /s/ Richard A. Stein
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                      By: Ruvir Corporation, a California
                                          corporation, as its general partner
                                          and individually in its capacity as a
                                          Constituent Partner

                                      By: /s/ G. Richard Katzenbach
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                      By: Double R/Tremont Partnership, an
                                          Illinois general partnership, as its
                                          limited partner and individually in
                                          its capacity as a Constituent Partner

                                       4
<PAGE>   5

                                      By: /s/ Richard A. Stein
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                      By: Bronco Ltd, a California limited
                                          partnership, as its limited partner
                                          and individually in its capacity as a
                                          Constituent Partner

                                      By: /s/ G. Richard Katzenbach
                                          -------------------------------------
                                         Its:
                                             ----------------------------------

                                      By: /s/ Myron C. Warshauer
                                          -------------------------------------
                                          Myron C. Warshauer, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                      By: /s/ Stanley Warshauer
                                          -------------------------------------
                                          Stanley Warshauer, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                      By: /s/ Steven A. Warshauer
                                          -------------------------------------
                                          Steven A. Warshauer, as its limited
                                          partner and individually in its
                                          capacity as a Constituent Partner

                                       5
<PAGE>   6

                                                                       EXHIBIT A

                                                     CLASS B UNITS
                                                     -------------

                                                        INITIAL
                                      PARTNERSHIP       CAPITAL      PERCENTAGE
   NAME AND ADDRESS OF PARTNER            UNITS         ACCOUNT       INTEREST
   ---------------------------        -----------       -------      ----------

                                       A-1
<PAGE>   7

                                                                       EXHIBIT B

                                   EXHIBIT E-7

               (ECH-NORTH LOOP/THEATER DISTRICT PARKING AGREEMENT)

     BACKGROUND

     On August 21, 2000, in connection with the closing of the Contribution
Agreement by and between North Loop-Tremont Partnership, an Illinois
partnership, ("Contributor"), the Partnership, ECH-Chicago Parking Limited
Partnership ("ECH"), and the Constituent partners of Contributor (the
"Constituent Partners"), dated November 6, 1997 and the Settlement Agreement and
Release of Claims by and between the Partnership, ECH, Contributor and the
Constituent Partners, Contributor received 91,406 Class B units of limited
Partnership Interest in the Partnership (the "ECHNLT Units") in exchange for its
limited partnership interest in ECH-North Loop/Theater District Parking Limited
Partnership. In connection with the issuance of the ECHNLT Units, the First
Amendment to the Agreement (the "FIRST AMENDMENT") was executed adding this
Exhibit E-7 to the Agreement, setting forth specific agreements regarding
additional rights and obligations of the Contributor with respect to the ECHNLT
Units. Such specific agreements are set forth below.

     All Capitalized terms used and not otherwise defined in this Exhibit E-7
have the meanings assigned in the Agreement.

     SPECIFIC AGREEMENTS

1.   ADMISSION TO PARTNERSHIP. Contributor is hereby admitted to the Partnership
     as an Additional Limited Partner in accordance with Section 12.2 of the
     Agreement and hereby agrees to become a party to the Agreement and to be
     bound by all of the terms, conditions and other provisions of the
     Agreement, including, but not limited to, the power of attorney set forth
     in Section 15.11 of the Agreement.

2.   RIGHT TO ASSIGN. Notwithstanding any other provision of this Exhibit E-7,
     the Agreement or the First Amendment, Contributor shall have the right to
     assign at any time and from time to time all or any portion of its ECHNLT
     Units, together with any and all other rights of Contributor pursuant to
     this Exhibit E-7 or the Agreement, to one or more of the constituent
     partners or shareholders, members, partners or beneficiaries of constituent
     partners of Contributor on the date hereof, whether direct or indirect,
     without the need for the consent of the General Partner or any other
     General Partner or Limited Partner and without being subject to the right
     of first refusal set forth in Section 11.3.A(a) of the Agreement, but in
     each case subject to the restrictions and conditions set forth in Sections
     11.3.C, 11.3.D, 11.3.E, 11.6.E and 11.6.F of the

                                      B-1
<PAGE>   8

     Agreement. Upon the delivery of written notice of such an assignment to the
     General Partner, each assignee of ECHNLT Units pursuant to the immediately
     preceding sentence shall be admitted to the Partnership as a Substituted
     Limited Partner owning the ECHNLT Units so assigned and having all of the
     rights of a Limited Partner under the Agreement, the First Amendment
     thereto and this Exhibit E-7, subject only to such assignee executing and
     delivering to the Partnership an acceptance of all of the terms and
     conditions of the Agreement and such other documents or instruments as the
     General Partner may reasonably require to effect such admission, in
     accordance with Section 11.4.B of the Agreement. Each permitted assignee of
     any of the ECHNLT Units issued to the Contributor pursuant to the
     Contribution Agreement that is admitted as a Substituted Limited Partner in
     accordance with this Section 2 or Article XI of the Agreement, for so long
     as such Person owns any such ECHNLT Units, is referred to in this Exhibit
     E-7 as an "INDIRECT EQUITY HOLDER." Upon satisfaction of the condition
     described in the second sentence of this Section 2, the General Partner
     shall amend Exhibit A to the Agreement in the manner described in Section
     11.4.C of the Agreement. For purposes of Section 8.6 of the Agreement,
     Contributor and each Indirect Equity Holder shall be entitled to exercise
     its right to require the Partnership to redeem all or any portion of the
     ECHNLT Units at any time on or after the first anniversary date of the
     issuance of the ECHNLT Units to Contributor.

3.   PRE-CONTRIBUTION GAIN. Contributor shall be allocated gain in accordance
     with Section 704(c) of the Code upon the sale, transfer, conveyance or
     disposition, directly or indirectly, of either or both Properties (as such
     term is defined in the First Amendment) (such gain being hereinafter
     referred to as "PRE-CONTRIBUTION GAIN"). Notwithstanding anything contained
     in the Agreement to the contrary, the Pre-Contribution Gain allocable to
     Contributor pursuant to Section 704(c) of the Code in connection with any
     sale, transfer, conveyance or disposition, directly or indirectly, of the
     Properties shall be, in aggregate and as of the date hereof, $12,424,927 in
     respect of the TD Self Park (as such term is defined in the First
     Amendment) and $35,127,926 in respect of NLTC (as such term is defined in
     the First Amendment), as each such amount is hereafter reduced in
     accordance with the provisions of Section 704(c) of the Code and Exhibit C,
     Paragraph 2 of the Agreement. The provisions of Exhibit C, Paragraph 2 to
     the Agreement shall be applicable with respect to the allocation of income,
     gain, loss and deduction pursuant to Section 704(c) of the Code to
     Contributor.

4.   ALLOCATIONS. Notwithstanding any contrary provision in the Agreement, for
     purposes of allocating items of income, gain, loss and deduction with
     respect to the Properties in the manner required by Section 704(c) of the
     Code, the Partnership shall employ, and shall cause any entity controlled
     by the Partnership which holds title to any of the Properties to employ,
     the "traditional method" as set forth in Regulation Section 1.704-3(b).

5.   OBLIGATION TO RESTORE DEFICIT CAPITAL ACCOUNTS. Contributor shall be a Part
     II Protected Partner pursuant to the Agreement for all relevant purposes.
     The Protected Amount allocable to Contributor pursuant to the Agreement
     shall be the amount

                                      B-2
<PAGE>   9

     designated on Schedule 1 to this Exhibit E-7 as the Protected Amount for
     Contributor. Notwithstanding anything contained in the Agreement to the
     contrary, any Indirect Equity Holder that is admitted as a Substitute
     Limited Partner pursuant to, and in accordance with, Section 2 to this
     Exhibit E-7 above shall be admitted as a Part II Protected Partner if and
     only if all of the following conditions are satisfied: (i) such Indirect
     Equity Holder shall expressly assume, in writing, all of the liabilities
     and obligations of a Part II Protected Partner pursuant to the Agreement
     for the benefit of the General Partner and the Partnership (such written
     assumption agreement, an "ASSUMPTION AGREEMENT"); (ii) such Indirect Equity
     Holder shall designate its Protected Amount in the Assumption Agreement,
     which Protected Amount shall be approved by Contributor (or the applicable
     immediate predecessor-in-interest to such Indirect Equity Holder) in
     writing; and (iii) the aggregate Protected Amount, at any time, allocated
     to Contributor and any and all Indirect Equity Holders allocated a
     Protected Amount pursuant to this sentence shall not exceed the Protected
     Amount presently allocated to Contributor on Schedule 1 to this Exhibit
     E-7.

                                      B-3
<PAGE>   10

                                                       SCHEDULE 1 TO EXHIBIT E-7

     PART II PROTECTED PARTNER                           PROTECTED AMOUNT
     -------------------------                           ----------------

                                      B-4

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