Document:

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                                                                   Exhibit 10.10
                             EMPLOYMENT AGREEMENT

         AGREEMENT, dated as of July __, 2000, by and between Key3Media Events,
Inc. (the "Company") and Robert Priest-Heck ("Executive").

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

         WHEREAS, the Company is desirous of employing Executive, and Executive
is desirous of being employed by the Company, on the terms and subject to the
conditions set forth in this Agreement;

         NOW, THEREFORE, in consideration of the premises, the mutual covenants
and agreements contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby mutually acknowledged, the parties
hereto agree as follows:

         1.       Definitions. The following terms shall have the indicated
                  -----------
meanings when used in this Agreement, unless the context requires otherwise:

                  (a)              "Base Salary Amount" shall mean $500,000 per
                                   full Contract Year.

                  (b)              "Benefit Plan" shall mean each vacation pay,
                                   sick pay, retirement, pension, profit
                                   sharing, welfare, medical, dental,
                                   disability, life insurance, deferred
                                   compensation, incentive compensation, stock
                                   issuance and option or other employee
                                   benefit plan, program or arrangement of any
                                   kind or nature whatsoever, if any.

                  (c)     "Board of Directors" shall mean the Board of
         Directors of the Company.

                  (d)     "Cause" shall have the meaning ascribed to that term
         in Section 7.

                  (e)     "Common Stock" shall mean the Common Stock, no par
         value, of the Company.

                  (f)     "Covenant Period" shall have the meaning ascribed to
         that term in Section 9(a).

                  (g)     "Contract Year" shall mean each year during the term
         hereof commencing June 1 and ending on the immediately following June
         30.

                  (h)      "Customer" shall have the meaning ascribed to that
         term in Section 9(c).

                  (i)      "Disability" shall have the meaning ascribed to that
         term in Section 6(a).

                  (j)      "Disability Period" shall have the meaning ascribed
         to that term in Section 6(a).

                  (k)      "Proprietary Information of the Company" shall have
         the meaning ascribed to that term in Section 10(a).
<PAGE>

                   (l)     "Company Businesses" shall have the meaning ascribed
          to that term in Section 9(a).

          2.  Employment.  The Company hereby employs Executive, and Executive
              ----------
hereby accepts employment with the Company, on the terms and subject to the
conditions set forth herein.

          3.               Term of Employment. The term of employment hereunder
                           ------------------
                           shall be for a period of four years commencing on the
                           date hereof and ending on June 30, 2004, subject to
                           early termination as herein provided.

          4.               Position and Duties. Executive shall serve as the
                           -------------------
                           Chief Operating Officer of the Company. Subject to
                           the authority of the Board of Directors and the Chief
                           Executive Officer of the Company, the Executive shall
                           have all of the powers and duties incident to the
                           office of Chief Operating Officer and such other
                           powers and duties as may from time to time be
                           prescribed by the Board of Directors or the Chief
                           Executive Officer of the Company. Executive agrees to
                           serve without further compensation, if elected or
                           appointed thereto, as an officer or a director of any
                           of the Company's domestic and foreign subsidiaries
                           and affiliates.

          5.                        Exclusive Duties. During Executive's
                                    ----------------
                           employment by the Company, Executive shall devote his
                           entire working time, attention and energies to the
                           business of the Company and will not take any actions
                           of the kind described in Sections 9(a), 9(b) and
                           9(c).

          6.       Compensation and Other Benefits.
                   -------------------------------

                   (a) Base Salary.  During each Contract Year of the term
                       -----------
          hereof, the Company shall pay to Executive the Base Salary Amount. The
          Base Salary Amount shall be subject to increase, at the sole
          discretion of the Chief Executive Officer or the Compensation
          Committee of the Board of Directors of the Company, as applicable, on
          or around each anniversary date of the execution of this Agreement.
          The Base Salary Amount shall be paid to Executive in accordance with
          the Company's regular payroll practices with respect to senior
          management compensation.

                   In the event that Executive shall become disabled as a result
          of bodily injury or physical or mental illness (whether or not
          occupational) to such extent that in the sole opinion of the Board of
          Directors, based upon competent medical advice, he can no longer
          perform the duties of Chief Operating Officer of the Company (a
          "Disability"), the Company shall only be obligated to continue to pay
          the Base Salary Amount to Executive for the 120-day period immediately
          following the date of Disability (the "Disability Period"). The right
          to receive salary payments during the Disability Period, if
          applicable, shall survive any termination of employment by virtue of
          Disability pursuant to Section 7.

                   (b)      Annual Performance Bonuses. During each Contract
                            --------------------------
          Year, the Company shall pay Executive an annual performance bonus as
          determined by the Board

                                      -2-
<PAGE>

        of Directors or its Compensation Committee in its sole discretion, the
        determination of which shall be based upon such standards, guidelines
        and factual circumstances as the Board of Directors or its Compensation
        Committee deems relevant, including, without limitation, the operating
        results for the Company during such Contract Year, the importance of the
        efforts of Executive in achieving such operating results and the
        achievement by the Company and/or Executive of performance goals
        previously established by the Board of Directors for such Contract Year;
        provided, however, that in no event shall the bonus for any Contract
        Year of the term hereof be less than (i) $125,000 for a full Contract
        Year or (ii) a pro rata portion of $125,000 for a partial Contract Year.

                 (c)               Expenses. Executive shall be entitled to
                                   --------
                                   receive prompt reimbursement from the Company
                                   for all documented business expenses incurred
                                   by him in the performance of his duties
                                   hereunder, provided that Executive properly
                                   accounts therefore in accordance with the
                                   Company's reimbursement policy, including,
                                   without limitation, the submission of
                                   supporting evidence as reasonably requested
                                   by the Company.

                 (d)                        Fringe Benefits. During the term
                                            ---------------
                                   hereof, Executive shall be entitled to
                                   participate in and receive benefits under all
                                   of the Company's Benefit Plans generally
                                   available to senior management of the
                                   Company.

                 (e)                       Vacations. During the term hereof,
                                           ---------
                                   Executive shall be entitled to sick leave and
                                   paid holidays consistent with the Company's
                                   sick leave and holiday policy for senior
                                   management and up to three weeks paid
                                   vacation during each Contract Year (or such
                                   other vacation time as is consistent with
                                   the Company's policy for senior management).

                 (f) Stock  Options.  Upon the adoption by the parent of the
                     --------------
         Company of a stock option plan for senior management of the Company and
         its subsidiaries and affiliates, Executive shall be entitled to a grant
         of 500,000 options to purchase the common stock of the parent of the
         Company, subject to the terms and conditions set forth in said stock
         option plan and the accompanying stock option agreement.

        7.  Termination.  The Company or Executive may terminate the employment
            -----------
of Executive hereunder upon the occurrence of a Disability (as defined in
Section 6(a)) for a period of no less than 120 days during any consecutive
twelve-month period. The Company may also terminate the employment of Executive
hereunder upon Executive's death or for Cause. For purposes hereof, "Cause"
shall mean (i) fraud, theft, misappropriation of funds or conviction of a
felony, (ii) Executive's engagement in illegal conduct tending to place
Executive or the Company in disrepute, (iii) dereliction or gross misconduct in
Executive's performance of her duties as an employee of the Company or the
failure of Executive to perform her duties in a manner consistent with the
instructions of the Board of Directors or the Chief Executive Officer of the
Company or (iv) violation by Executive of any of her material covenants
contained in this

                                      -3-
<PAGE>

Agreement, including, without limitation, Section 10. Upon the termination of
Executive's employment for any reason, Executive shall be entitled to receive
all compensation (including, without limitation, a pro rata portion of the
minimum annual performance bonus, unless such termination is for Cause) for the
then current Contract Year through the date of such termination plus all accrued
but unreimbursed expenses. In addition, upon the termination of Executive's
employment for any reason other than for or by virtue of Cause, death,
Disability or Executive's voluntary termination of employment, the Company shall
continue to be responsible for the payment of all Base Salary Amount and minimum
annual performance bonuses for the remainder of the term hereof; provided,
however, that Executive shall have a duty to mitigate (as to a new position
comparable to Executive's position and salary hereunder) commencing on the first
anniversary of the date of termination; and, further provided that Executive
shall perform her covenants, duties and obligations under Sections 9(a), 9(b)
and 9(c) during the remainder of the term hereof. Termination of Executive's
employment for any reason whatsoever shall not affect Executive's ability to
exercise stock options that have vested prior to the date of termination.

         8. Developmental Rights. Executive agrees that any developments by way
            --------------------
of invention, design, copyright, trademark or other matters which may be
developed or perfected by him during the term hereof, and which relate to the
business of the Company or its subsidiaries or affiliates, shall be the property
of the Company without any interest therein by Executive, and she will, at the
request and expense of the Company, apply for and prosecute letters patent
thereon in the United States or in foreign countries if the Company so requests,
and will assign and transfer the same to the Company together with any letters
patent, copyrights, trademarks and applications therefore; provided, however,
that the foregoing shall not apply to an invention that Executive develops
entirely on her own time without using the Company's equipment, supplies,
facilities or trade secret information except for those inventions that either:

                  (a) relate at the time of conception or reduction to practice
         of the invention to the Company's business, or actual or demonstrably
         anticipated research or development of the Company; or

                  (b)      result from any work performed by Executive for the
         Company.

         9.       COVENANTS.
                  ---------

                  (a) Covenant Not to Compete. During the two (2) year period
                      -----------------------
         following the termination of this Agreement (the "Covenant Period"),
         Executive shall not, without the prior written consent of the Company,
         directly or indirectly engage in or assist any activity which is the
         same as, similar to or competitive with the Company Businesses (other
         than on behalf of the Company or any of its subsidiaries or affiliates)
         including, without limitation, whether such engagement or assistance is
         as an officer, director, proprietor, employee, partner, investor (other
         than as a holder of less than 5% of the outstanding capital stock of a
         publicly traded corporation), guarantor, consultant, advisor, agent,
         sales representative or other participant, anywhere in the world that
         the Company or any of its subsidiaries or affiliates has been engaged,
         including, without limitation, the

                                      -4-
<PAGE>

                 United States, Canada, Mexico, England, Europe, South America,
                 Asia and Australia. The "Company Businesses" shall mean the
                 production and/or promotion of trade shows, conferences and
                 seminars, as well as the publication of related magazines or
                 journals.

                          (b) Solicitation of Employees. During the Covenant
                              -------------------------
                 Period, Executive shall not (i) directly or indirectly induce
                 or attempt to induce (regardless of who initiates the contact)
                 any person then employed (whether part-time or full-time) by
                 the Company or any of its subsidiaries or affiliates, whether
                 as an officer, employee, consultant, adviser or independent
                 contractor, to leave the employ of the Company or to cease
                 providing or otherwise alter the services then provided to the
                 Company or to any of its subsidiaries or affiliates or (ii) in
                 any other manner seek to engage or employ any such person
                 (whether or not for compensation) as an officer, employee,
                 consultant, adviser or independent contractor in connection
                 with the operation of any business which is the same as or
                 similar to any of the Company Businesses.

                          (c)  Non-Solicitation of Customers. During the
                               -----------------------------
                 Covenant Period, Executive shall not solicit any Customers of
                 the Company or any of its subsidiaries or affiliates or
                 encourage (regardless of who initiates the contact) any such
                 Customers to use the facilities or services of any Competitor
                 of the Company or any of its subsidiaries or affiliates.
                 "Customer" shall mean any person who contracts with the Company
                 or any of its subsidiaries or affiliates to provide services
                 related to the Company Businesses.

                 10.  Confidentiality.  Executive shall not at any time (during
                      ---------------
or for a period of sixty (60) months after termination of employment) disclose
(except as may be required by law) or use, except in the pursuit of the business
of the Company or any of its subsidiaries or affiliates, any Proprietary
Information of the Company. "Proprietary Information of the Company" means all
information known or intended to be known only to employees of the Company or
any of its subsidiaries or affiliates in a confidential relationship with the
Company or any of its subsidiaries or affiliates relating to technical matters
pertaining to the business of the Company or any of its subsidiaries or
affiliates, but shall not include any information within the public domain.
Executive agrees not to remove any documents, records or other information from
the premises of the Company or any of its subsidiaries or affiliates containing
any such proprietary information, except in the pursuit of the business of the
Company or any of its subsidiaries or affiliates, and acknowledges that such
documents, records and other information are the exclusive property of the
Company or its subsidiaries or affiliates. Upon termination of Executive's
employment, Executive shall immediately return all Proprietary Information of
the Company and all copies thereof to the Company.

         11.     General Provisions.
                 ------------------

                 (a) Expenses.  All costs and expenses incurred by either of the
                     --------
        parties in connection with this Agreement and any transactions
        contemplated hereby shall be paid by that party.

                 (b) Notices. All notices, demands and other communications
                     -------
        hereunder shall be in writing and shall be given or made (and shall be
        deemed to have been duly given or made upon receipt) by delivery in
        person, by overnight courier service, by cable, by

                                      -5-
<PAGE>

telecopy, by telegram, by telex or by registered or certified mail to the
respective parties at the following addresses (or at such other address for a
party as shall be specified in a notice given in accordance with this Section
11(b)):

                          (i)      If to the Company:

                                   Key3Media Events, Inc.
                                   300 Vintage Park Drive
                                   Foster City, CA 94404-1138
                                   Attention: General Counsel

                          (ii)     If to Executive:

                                   Robert Priest-Heck

          (c) Headings.  The descriptive headings contained in this Agreement
              --------
are for convenience of reference only and shall not affect in any way the
meaning or interpretation of this Agreement.

          (d)  Successors; Binding Agreement.  This Agreement shall be binding
               -----------------------------
upon and inure to the benefit of the parties hereto and their respective heirs,
devisees, legatees, executors, administrators, successors and personal or legal
representatives. If Executive is domiciled in a community property state or a
state that has adopted the Uniform Marital Property Act or equivalent or if
Executive is domiciled in a state that grants to his spouse any other marital
rights in Executive's assets (including, without limitation, dower rights or a
right to elect against Executive's will or to claim a forced share of
Executive's estate), this Agreement shall also inure to the benefit of, and
shall also be binding upon, his spouse. If Executive should die while any
amounts would still be payable to her hereunder if he had continued to live, all
such amounts, unless otherwise provided herein, shall be paid in accordance with
the terms of this Agreement to Executive's designee or, if there be no such
designee, to Executive's heirs, devisees, legatees or executors or
administrators of Executive's estate, as appropriate.

          (e) Severability.  If any provision of this Agreement is held to be
              ------------
illegal, invalid or unenforceable under existing or future laws effective during
the term of this Agreement, such provisions shall be fully severable, the
Agreement shall be construed and enforced as if such illegal, invalid or
unenforceable provision had never comprised a part of this Agreement, and the
remaining provisions of this Agreement shall remain in full force and effect and
shall not be affected by the illegal, invalid or unenforceable provision or by
its severance from this Agreement. Furthermore, in lieu of such illegal, invalid
or unenforceable provision, there shay be added automatically as part of this
Agreement a provision as similar in terms to such illegal, invalid or
unenforceable provision as may be possible and be legal, valid and enforceable.

         (f)      Entire Agreement. This Agreement and any applicable option
                  ----------------
agreements pursuant to Section 6(g) constitutes the entire agreement of the
parties hereto

                                      -6-
<PAGE>

with respect to the subject matter hereof and thereof and supersedes all prior
agreements and understandings, both written and oral, between the Company and
Executive with respect to the subject matter hereof and thereof.

         (g) Assignment.  This Agreement and the rights and duties hereunder are
             ----------
not assignable by Executive. This Agreement and the rights and duties hereunder
may not be assigned by the Company without the express written consent of
Executive (which consent may be granted or withheld in the sole discretion of
Executive), except that such consent shall not be required in order for the
Company to assign this Agreement or the rights or duties hereunder to an
affiliate (as such term is defined in Section 9(b)) of the Company or to a third
party in connection with the merger or consolidation of the Company with, or the
sale of all or substantially all of the assets or business of the Company to,
that third party.

         (h) Amendment; Waiver.  This Agreement may not be amended or modified
             -----------------
except by an instrument in writing signed by, or on behalf of, the Company and
Executive. Either party to this Agreement may (a) extend the time for the
performance of any of the obligations or other acts of the other party or (b)
waive compliance with any of the agreements or conditions of the other party
contained herein. Any such extension or waiver shall be valid only if set forth
in an instrument in writing signed by the party to be bound thereby. Any waiver
of any term or condition shall not be construed as a waiver of any subsequent
breach or a subsequent waiver of the same term or condition, or a waiver of any
other term or condition, of this Agreement. The failure of any party to assert
any of its rights hereunder shall not constitute a waiver of any such rights.

         (i) Governing Law. This Agreement shall be governed by, and construed
             -------------
in accordance with, the laws of the State of New York, applicable to contracts
executed in and to be performed entirely within that state.

         (j) Jurisdiction and Venue.  The parties hereto agree that all actions
             ----------------------
or proceedings initiated by either party hereto and arising directly or
indirectly out of this Agreement which are brought pursuant to judicial
proceedings shall be litigated in a Federal or state court located in the State
of New York. The parties hereto expressly submit and consent in advance to such
jurisdiction and agree that service of summons and complaint or other process or
papers may be made by registered or certified mail addressed to the relevant
party at the address to which notices are to be sent pursuant to Section 11(b)
of this Agreement. The parties hereto waive any claim that a Federal or state
court located in the State of New York is an inconvenient forum or an improper
forum based on lack of venue.

         (k) Equitable Relief.  Executive acknowledges that the covenants
             ----------------
contained in Sections 9 and 10 are reasonable and necessary to protect the
legitimate interests of the Company, that in the absence of such covenants the
Company would not have entered into this Agreement, that any breach or
threatened breach of such covenants will result in irreparable injury to the
Company and that the remedy at law for such breach or threatened breach would be
inadequate. Accordingly, the Executive agrees that the Company, in addition to
any other rights or remedies which it may have, shall be entitled

                                      -7-
<PAGE>

           to seek such equitable and injunctive relief as may be available from
           any court of competent jurisdiction to restrain the Executive from
           any breach or threatened breach of such covenants.

                   (l)  Attorneys' Fees.  If any legal action or other
                        ---------------
           proceeding is brought for the enforcement of this Agreement, the
           prevailing party shall be entitled to recover reasonable attorneys'
           fees and other costs incurred in that action or proceeding, in
           addition to any other relief to which it may be entitled.

                    (m) Counterparts.  This Agreement may be executed in one or
                        ------------
           more counterparts, and by the parties hereto in separate
           counterparts, each of which when executed shall be deemed to be an
           original while all of which taken together shall constitute one and
           the same instrument.

           IN WITNESS WHEREOF, the Company and Executive have executed this
Agreement as of the date and year first written above.

                                        Key3Media Events, Inc.

                                        By:
                                           -------------------------------
                                        Title:
                                              ----------------------------

                                        ----------------------------------
                                         Robert Priest-Heck

                                      -8-<PAGE>

                                                                    EXHIBIT 4.1

   NUMBER                                                         SHARES
0S_______                                                         _______

                                                             SEE REVERSE FOR
                                                             CERTAIN
                                                             DEFINITIONS AND
INCORPORATED UNDER THE LAWS OF                               STATEMENTS
THE STATE OF DELAWARE                                        RELATING TO RIGHTS,
                                                             PREFERENCES,
                                                             PRIVILEGES AND
                                                             RESTRICTIONS, IF
                                                             ANY

                           ORASURE TECHNOLOGIES, INC.

This Certifies That                                             CUSIP 68554V 108

is the owner of

                    FULLY PAID AND NON-ASSESSABLE SHARES OF
                COMMON STOCK, PAR VALUE $0.000001 PER SHARE, OF

                           OraSure Technologies, Inc.

(hereinafter and on the back hereof called the "Corporation") transferable on
the books of the Corporation by the holder hereof in person or by duly
authorized attorney upon surrender of this certificate properly endorsed.  This
certificate and the shares represented hereby are issued and shall be held
subject to all of the provisions of the Certificate of Incorporation of the
Corporation, as amended from time to time, the Bylaws of the Corporation, as
amended from time to time, and the laws of the State of Delaware, as amended
from time to time, all of which are by reference incorporated herein and to all
of which the holder of this certificate by acceptance hereof assents and agrees
to be bound.  This certificate is not valid unless countersigned and registered
by the Transfer Agent and Registrar.

     WITNESS the facsimile seal of the Corporation and the facsimile signatures
of its duly authorized officers.

Dated                   ORASURE TECHNOLOGIES, INC.

                            CORPORATE SEAL
                               DELAWARE
____________________                 _________________________
     SECRETARY                        CHIEF EXECUTIVE OFFICER

                         COUNTERSIGNED AND REGISTERED:
                    ChaseMellon Shareholder Services, L.L.C.
                                 (New York, NY)

                                       TRANSFER AGENT AND REGISTRAR

                                   BY: _______________________________
                                       AUTHORIZED SIGNATURE
<PAGE>

                           ORASURE TECHNOLOGIES, INC.

     The Corporation will furnish without charge to each stockholder who so
requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof and
the qualifications, limitations or restrictions of such preferences and/or
rights.

     This certificate also evidences and entitles the holder hereof to certain
Rights as set forth in the Rights Agreement between OraSure Technologies, Inc.
(the "Company") and ChaseMellon Shareholder Services, L.L.C. (the "Rights
Agent"), dated as of May 6, 2000 (the "Rights Agreement"), the terms of which
are hereby incorporated herein by reference and a copy of which is on file at
the principal offices of the Company. Under certain circumstances, as set forth
in the Rights Agreement, such Rights will be evidenced by separate certificates
and will no longer be evidenced by this certificate. The Company will mail to
the holder of this certificate a copy of the Rights Agreement, as in effect on
the date of mailing, without charge, promptly after receipt of a written request
therefor. Under certain circumstances set forth in the Rights Agreement, Rights
issued to, or held by, any Person who is, was or becomes an Acquiring Person or
any Affiliate or Associate thereof (as such terms are defined in the Rights
Agreement), whether currently held by or on behalf of such Person or by any
subsequent holder, may become null and void.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:
<TABLE>
<S>        <C>                                <C>                <C>
TEN COM    - as tenants in common             UNIF GIFT MIN ACT ________ Custodian _________
TEN ENT    - as tenants by the entireties                         (Cust)             (Minor)
JT TEN     - as joint tenants with right of                       under Uniform Gifts to Minors
             survivorship and not as tenants                      Act ____________________
             in common                                                     (State)
TOD        - transfer on death direction in   UNIF TRF MIN ACT    ______ Custodian (until age ___)
             the event of owner's death                           (Cust)
             to person named on face and                          _______ under Uniform Transfers
             subject to TOD rules referenced                      (Minor)
                                                                  to Minors Act _____________
                                                                                   (State)
</TABLE>

    Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, _________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE

________________

________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE

________________________________________________________________________________

________________________________________________________________________________

______________________________________________________________________ Shares of
the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

_______________________________________________________________________ Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.
<PAGE>

Dated ______________________       X   __________________________________

                                   X   ___________________________________

                                NOTICE:  THE SIGNATURE(S) TO THIS ASSIGNMENT
                                         MUST CORRESPOND WITH THE NAME(S) AS
                                         WRITTEN UPON THE FACE OF THE
                                         CERTIFICATE IN EVERY PARTICULAR,
                                         WITHOUT ALTERATION OR ENLARGEMENT OR
                                         ANY CHANGE WHATEVER.

Signature(s) Guaranteed

By   ______________________________
     THE SIGNATURE(S) SHOULD BE
     GUARANTEED BY AN ELIGIBLE
     GUARANTOR INSTITUTION (BANKS,
     STOCKBROKERS, SAVINGS AND
     LOAN ASSOCIATIONS AND CREDIT
     UNIONS WITH MEMBERSHIP IN AN
     APPROVED SIGNATURE
     GUARANTEE MEDALLION
     PROGRAM), PURSUANT TO S.E.C.
     RULE 17Ad-15.

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