Document:

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                                                                    EXHIBIT 10.6

SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE BEEN ACQUIRED FOR INVESTMENT AND
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. SUCH SECURITIES MAY
NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION UNLESS THE
TRANSFER IS IN ACCORDANCE WITH RULE 144 OR SIMILAR RULE OR UNLESS THE COMPANY
RECEIVES AN OPINION OF COUNSEL REASONABLY ACCEPTABLE TO IT STATING THAT SUCH
SALE OR TRANSFER IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY
REQUIREMENTS OF SAID ACT.

No. WC-1                  STOCK PURCHASE WARRANT
               To Purchase Shares of Series C Preferred Stock of
                              Inventa Corporation

     THIS CERTIFIES that, for value received, Greyrock Capital, a division of
Banc of America Commercial Finance Corporation ("Holder"), is entitled, upon the
terms and subject to the conditions hereinafter set forth, at any time on or
after the date hereof and on or prior to November 30, 2004 (the "Termination
Date"), but not thereafter, to subscribe for and purchase, from Inventa
Corporation, a California corporation (the "Company"), 160,000 shares of Series
C Preferred Stock (the "Shares") at an exercise price of $2.50 per share (the
"Exercise Price"), subject to adjustment as set forth below.

     1.   Title to Warrant.  Prior to the expiration hereof and subject to
          ----------------
compliance with applicable laws, this Warrant and all rights hereunder are
transferable, in whole or in part, at the office or agency of the Company,
referred to in Section 2 hereof, by the holder hereof in person or by duly
authorized attorney, upon surrender of this Warrant together with the Assignment
Form annexed hereto properly endorsed.

     2.   Exercise of Warrant.  The purchase rights represented by this Warrant
          -------------------
are exercisable by the registered holder hereof, in whole or in part, at any
time before the close of business on the Termination Date by the surrender of
this Warrant and the Notice of Exercise form annexed hereto duly executed at the
principal office of the Company at the address set forth in Section 15(c) hereof
(or such other office or agency of the Company as it may designate by notice in
writing to the registered holder hereof at the address of such holder appearing
on the books of the Company), and upon payment of the Exercise Price for the
Shares thereby purchased (by cash or by check or bank draft payable to the order
of the Company or by cancellation of indebtedness of the Company to the holder
hereof, if any, at the time of exercise in an amount equal to the purchase price
of the Shares thereby purchased); whereupon the holder of this Warrant shall be
entitled to receive a certificate for the number of shares of Series C Preferred
Stock so purchased.  The Company agrees that if at the time of the surrender of
this Warrant and purchase the holder hereof shall be entitled to exercise this
Warrant, the shares so purchased shall be and be deemed to be issued to such
holder as the record
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owner of such shares at the close of business on the date on which this Warrant
shall have been exercised as aforesaid.

     3.   Right to Convert Warrant.  The registered holder hereof shall have the
          ------------------------
right to convert this Warrant, by the surrender of this Warrant and the Notice
of Conversion form annexed hereto duly executed at the principal office of the
Company (or such other office or agency of the Company as it may designate by
notice in writing to the registered holder hereof at the address of such holder
appearing on the books of the Company), in whole but not in part, at any time
before the close of business on the Termination Date, into the Shares as
provided for in this Section 3.  Upon exercise of this conversion right, the
holder hereof shall be entitled to receive that number of Shares equal to the
quotient obtained by dividing [(A - B)(X)] by (A), where:

          (A)  = the Fair Market Value (as defined below) of one (1) Share on
                 the date of conversion of this Warrant.

          (B)  = the Exercise Price for one (1) Share under this Warrant.

          (X)  = the number of Shares issuable upon exercise of this Warrant.

     If the above calculation results in a zero or a negative number, then no
Shares shall be issued or issuable upon conversion of this Warrant.

     "Fair Market Value" of a Share shall mean:

          (a)    if the conversion right is being exercised upon the occurrence
                 of a transaction specified in paragraph 10(a) hereof, the value
                 of the consideration (determined as set forth in the Company's
                 Articles of Incorporation, as amended) to be received pursuant
                 to such transaction by the holder of one (1) Share issuable
                 upon exercise of this Warrant;

          (b)    if the conversion right is being exercised upon the occurrence
                 of the Company's initial public offering, the initial public
                 offering price per share (before deducting underwriting
                 commissions and discounts and offering expenses) multiplied by
                 the number of shares of Common Stock issuable upon conversion
                 of one (1) Share issuable upon exercise of this Warrant;

          (c)    if the conversion right is being exercised after, and not in
                 connection with the Company's initial public offering, and:

                 (i)   if traded on a securities exchange, the fair market value
                       shall be deemed to be the average of the closing prices
                       of the securities on such exchange over the thirty (30)
                       day period ending three (3) days before the day the
                       current fair market value of the securities is being
                       determined; or

                                      -2-
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                 (ii)  if actively traded over-the-counter, the fair market
                       value shall be deemed to be the average of the closing
                       bid or sale prices (whichever are applicable) over the
                       thirty (30) day period ending three (3) days before the
                       day the current fair market value of the securities is
                       being determined; and

          (d)    in all other cases, the fair value as determined in good faith
                 by the Company's Board of Directors.

     Upon conversion of this Warrant, the registered holder hereof shall be
entitled to receive a certificate for the number of Shares determined as
aforesaid.

     4.   Issuance of Stock; No Fractional Shares or Scrip.  Certificates for
          ------------------------------------------------
the stock purchased hereunder or issuable upon conversion hereof shall be
delivered to the holder hereof promptly after the date on which this Warrant
shall have been exercised or converted as aforesaid.  The Company covenants that
all Shares which may be issued upon the exercise of rights represented by this
Warrant will, upon exercise of the rights represented by this Warrant, be fully
paid and nonassessable and free from all taxes, liens and charges in respect of
the issue thereof (other than taxes in respect of any transfer occurring
contemporaneously with such issue).  The Company agrees that, if at the time of
the surrender of this Warrant and exercise of the rights represented hereby, the
holder hereof shall be entitled to exercise such rights, the Shares so issued
shall be and be deemed to be issued to such holder as the record owner of such
Shares as of the close of business on the date on which this Warrant shall have
been exercised or converted as aforesaid.  No fractional shares or scrip
representing fractional shares shall be issued upon the exercise or conversion
of this Warrant.  With respect to any fraction of a Share called for upon the
exercise or conversion of this Warrant, an amount equal to such fraction
multiplied by the then current price at which each Share may be purchased
hereunder shall be paid in cash to the holder of this Warrant.

     5.   Charges, Taxes and Expenses.  Issuance of certificates for the Shares
          ---------------------------
upon the exercise or conversion of this Warrant shall be made without charge to
the holder hereof for any issue or transfer tax or other incidental expense in
respect of the issuance of such certificate, all of which taxes and expenses
shall be paid by the Company, and such certificates shall be issued in the name
of the holder of this Warrant or in such name or names as may be directed by the
holder of this Warrant; provided, however, that in the event certificates for
                        --------  -------
Shares are to be issued in a name other than the name of the holder of this
Warrant, this Warrant when surrendered for exercise or conversion shall be
accompanied by the Assignment Form attached hereto duly executed by the holder
hereof; and provided further, that upon any transfer involved in the issuance or
            -------- -------
delivery of any certificates for the Shares, the Company may require, as a
condition thereto, the payment of a sum sufficient to reimburse it for any
transfer tax incidental thereto.

     6.   No Rights as Shareholders.  This Warrant does not entitle the holder
          -------------------------
hereof to any voting rights or other rights as a shareholder of the Company
prior to the exercise or conversion thereof.

                                      -3-
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     7.   Exchange and Registry of Warrant.  This Warrant is exchangeable, upon
          --------------------------------
the surrender hereof by the registered holder at the above-mentioned office or
agency of the Company, for a new Warrant of like tenor and dated as of such
exchange.

     The Company shall maintain at the above-mentioned office or agency a
registry showing the name and address of the registered holder of this Warrant.
This Warrant may be surrendered for exchange, transfer or exercise, in
accordance with its terms, at such office or agency of the Company, and the
Company shall be entitled to rely in all respects, prior to written notice to
the contrary, upon such registry.

     8.   Loss, Theft, Destruction or Mutilation of Warrant.  Upon receipt by
          -------------------------------------------------
the Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
reimbursement to the Company of all reasonable expenses incidental thereto, and
upon surrender and cancellation of this Warrant, if mutilated, the Company will
make and deliver a new Warrant of like tenor and dated as of such cancellation,
in lieu of this Warrant.

     9.   Saturdays, Sundays, Holidays, etc. If the last or appointed day for
          ----------------------------------
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday or a Sunday or shall be a legal holiday, then such
action may be taken or such right may be exercised on the next succeeding day
not a legal holiday.

     10.  Anti-Dilution Provision.
          -----------------------

          (a) Merger, Sale of Assets, etc. In case of (1) the Company's
              ----------------------------
consolidation or merger with or into another corporation in which the Company is
not the surviving entity, or a merger in which the Company is the surviving
entity but the shares of the Company's capital stock outstanding immediately
prior to the merger are converted, by virtue of the merger, into other property,
whether in the form of securities, cash or otherwise, or (2) the sale or
transfer of all or substantially all of the Company's assets, then, as part of
such reorganization, recapitalization, merger, consolidation, sale or transfer,
lawful provision shall be made so that there shall thereafter be deliverable
upon the exercise of this Warrant or any portion thereof (in lieu of or in
addition to the number of Shares theretofore deliverable, as appropriate), and
without payment of any additional consideration, the number of shares of stock
or other securities or property to which the holder of the number of Shares
which would otherwise have been deliverable upon the exercise of this Warrant or
any portion thereof at the time of such reorganization, reclassification,
recapitalization, consolidation, merger, sale or transfer would have been
entitled to receive in such reorganization, reclassification, recapitalization,
consolidation, merger, sale or transfer.  This Section 10(a) shall apply to
successive reorganization, reclassifications, recapitalizations, consolidations,
mergers, sales and transfers and to the stock or securities of any other
corporation that are at the time receivable upon the exercise of this Warrant.
If the per-share consideration payable to the registered holder hereof for
Shares in connection with any transaction described in this Section 10(a) is in
a form other than cash or marketable securities, then the value of such
consideration shall be determined in good faith by the Company's Board of
Directors.

                                      -4-
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          (b) Reclassification, etc. If the Company at any time shall, by
              ----------------------
subdivision, combination or reclassification of securities or otherwise, change
any of the securities to which purchase rights under this Warrant exist into the
same or a different number of securities of any class or classes, this Warrant
shall thereafter be to acquire such number and kind of securities as would have
been issuable as the result of such change with respect to the securities which
were subject to the purchase rights under this Warrant immediately prior to such
subdivision, combination, reclassification or other change.  If the Shares
issuable upon the exercise of this Warrant are subdivided or combined into a
greater or smaller number of the Shares, the purchase price under this Warrant
shall be proportionately reduced in case of subdivision of shares or
proportionately increased in the case of combination of shares, in both cases by
the ratio which the total number of the Shares to be outstanding immediately
after such event bears to the total number of the Shares outstanding immediately
prior to such event.

          (c) Cash Distributions.  No adjustment on account of cash dividends on
              ------------------
the Shares issuable upon the exercise of this Warrant will be made to the
purchase price under this Warrant.

          (d) Authorized Shares.  The Company covenants that, during the period
              -----------------
the Warrant is outstanding, it will reserve from its authorized and unissued
Preferred Stock a sufficient number of shares to provide for the issuance of the
Shares upon the exercise of any purchase rights under this Warrant.  The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Shares upon
the exercise of the purchase rights under this Warrant.

          (e) Conversion Price Adjustments.  The rate at which the Shares are
              ----------------------------
convertible into shares of Common Stock of the Company is subject to adjustment
as set forth in the Company's Articles of Incorporation, as amended.  Any
adjustment to the conversion rate of the Shares issuable upon the exercise of
this Warrant effected prior to any exercise or conversion of this Warrant shall
apply to any Shares thereafter issued pursuant to the terms hereof.

     11.  Registration Rights.  The Shares shall have the registration rights
          -------------------
set forth in the Restated Registration Rights Agreement among the Company and
certain investors dated as of May 11, 1998, as amended (the "Registration Rights
Agreement"), and, effective as of the date of issuance of such Shares, the term
"Shares" as defined in the Registration Rights Agreement shall include the
Shares issuable upon exercise of this Warrant and the term "Registrable
Securities" as defined in the Registration Rights Agreement shall include the
shares of Common Stock issuable upon conversion of the Shares.

     12.  Restrictions on Transferability of Securities.
          ---------------------------------------------

          (a) Restrictions on Transferability.  This Warrant, the Shares
              -------------------------------
issuable upon exercise of this Warrant, and the shares of Common Stock issuable
upon conversion of the Shares (collectively the "Securities") shall not be sold,
assigned, transferred or pledged except upon the conditions specified in this
Section 12, which conditions are intended to ensure compliance with the
provisions of the Securities Act of 1933, as amended (the "Securities Act").
Each holder of any of

                                      -5-
<PAGE>

the Securities will cause any proposed purchaser, assignee, transferee, or
pledgee of the Securities held by such holder to agree to take and hold such
Securities subject to the provisions and upon the conditions specified in this
Section 12.

          (b) Restrictive Legend.  Each certificate representing the Securities
              ------------------
and any other securities issued in respect of the Securities upon any stock
split, stock dividend, recapitalization, merger, consolidation or similar event,
shall (unless otherwise permitted by the provisions of Section 12(c) below) be
stamped or otherwise imprinted with a legend in the following form (in addition
to any legend required under applicable state securities laws):

     THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR
INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933.  SUCH
SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION
UNLESS THE TRANSFER IS IN ACCORDANCE WITH RULE 144 OR SIMILAR RULE OR UNLESS THE
COMPANY RECEIVES AN OPINION OF COUNSEL REASONABLY ACCEPTABLE TO IT STATING THAT
SUCH SALE OR TRANSFER IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY
REQUIREMENTS OF SAID ACT.

     Each holder of Securities and each subsequent transferee (hereinafter
collectively referred to as a "Holder") consents to the Company making a
notation on its records and giving instructions to any transfer agent of the
Securities in order to implement the restrictions on transfer established in
this Section 12.

          (c) Notice of Proposed Transfers.  Each Holder of a certificate
              ----------------------------
representing the Securities, by acceptance thereof, agrees to comply in all
respects with the provisions of this Section 12(c).  Prior to any proposed sale,
assignment, transfer or pledge of any Securities (other than (i) a transfer not
involving a change in beneficial ownership, (ii) in transactions involving the
distribution without consideration of Securities by a Holder to any of its
partners, or retired partners, or to the estate of any of its partners or
retired partners, (iii) a transfer to an affiliated fund, partnership or
company, which is not a competitor of the Company, subject to compliance with
applicable securities laws or (iv) transfers in compliance with Rule 144, so
long as the Company is furnished with satisfactory evidence of compliance with
such Rule), unless there is in effect a registration statement under the
Securities Act covering the proposed transfer, the Holder thereof shall give
written notice to the Company of such Holder's intention to effect such
transfer, sale, assignment or pledge.  Each such notice shall describe the
manner and circumstances of the proposed transfer, sale, assignment or pledge in
sufficient detail, and shall be accompanied, at such Holder's expense, by either
(i) an opinion of counsel (who shall, and whose opinion shall be, addressed to
the Company and reasonably satisfactory to the Company) to the effect that the
proposed transfer of the Securities may be effected without registration under
the Securities Act or (ii) a "no action" letter from the Securities and Exchange
Commission (the "Commission") to the effect that the transfer of such securities
without registration will not result in a recommendation by the staff of the
Commission that action be taken with respect thereto, whereupon the Holder of
such Securities shall be entitled to transfer such Securities in accordance with
the terms of the notice delivered by such Holder to the

                                      -6-
<PAGE>

Company. Each certificate evidencing the Securities transferred as above
provided shall bear, except if such transfer is made pursuant to Rule 144, the
appropriate restrictive legend set forth in Section 12(b) above, except that
such certificate shall not bear such restrictive legend if in the opinion of
counsel for such Holder and in the opinion of counsel for the Company such
legend is not required in order to establish compliance with any provision of
the Securities Act.

          (d) Removal of Restrictions on Transfer of Securities.  Any legend
              -------------------------------------------------
referred to in Section 12(b) hereof stamped on a certificate evidencing the
Securities and the stock transfer instructions and record notations with respect
to the Securities shall be removed, and the Company shall issue a certificate
without such legend to the Holder of the Securities if the Securities are
registered under the Securities Act, or if such Holder provides the Company with
an opinion of counsel (which may be counsel for the Company) reasonably
satisfactory to the Company to the effect that a public sale or transfer of such
security may be made without registration under the Securities Act or such
Holder provides the Company with reasonable assurances, which may, at the option
of the Company, include an opinion of counsel (which may be counsel for the
Company) reasonably satisfactory to the Company, that such security can be sold
pursuant to paragraph (k) of Rule 144 (or any successor provision) under the
Securities Act.

     13.  Investment Representations of Holder.  With respect to the acquisition
          ------------------------------------
of any of the Securities, Holder hereby represents and warrants to the Company
as follows:

          (a) Experience.  Holder has substantial experience in evaluating and
              ----------
investing in private placement transactions of securities in companies similar
to the Company so that it is capable of evaluating the merits and risks of its
investment in the Company and has the capacity to protect its own interests.
Holder is an "accredited investor" within the meaning of Regulation D
promulgated under the Securities Act.

          (b) Investment.  Holder is acquiring the Securities for investment for
              ----------
its own account, not as a nominee or agent, and not with the view to, or for
resale in connection with, any distribution thereof.  Holder understands that
the Securities have not been, and will not be, registered under the Securities
Act by reason of a specific exemption from the registration provisions of the
Securities Act, the availability of which depends upon, among other things, the
bona fide nature of the investment intent and the accuracy of Holder's
representations as expressed herein.

          (c) Rule 144.  Holder acknowledges that the Securities must be held
              --------
indefinitely unless subsequently registered under the Securities Act, or unless
an exemption from such registration is available.  Holder is aware of the
provisions of Rules 144 and 144A promulgated under the Securities Act that
permit limited resale of securities purchased in a private placement subject to
satisfaction of certain conditions.

          (d) No Public Market.  Holder understands that no public market now
              ----------------
exists for any of the securities issued by the Company and that the Company has
made no assurances that a public market will ever exist for the Securities.

                                      -7-
<PAGE>

          (e) Access to Data.  Holder has had an opportunity to discuss the
              --------------
Company's business, management and financial affairs with the Company's
management and has also had an opportunity to ask questions of the Company's
officers, which questions were answered to its satisfaction.

     14.  Notices.
          -------

          (a) Notice of Public Offering.  If at any time prior to the exercise
              -------------------------
or conversion of this Warrant in full the Company shall determine to effect a
registered public offering of its securities, then the Company will give the
holder of this Warrant at least thirty (30) days prior written notice of the
proposed effective date of the transaction.

          (b) Notice of Record Date.  If at any time prior to the exercise or
              ---------------------
conversion of this Warrant in full the Company takes a record of the holders of
the Company's stock for the purpose of determining the holders thereof who are
entitled to receive any dividend or other distribution, any right to subscribe
for, purchase or otherwise acquire any shares of stock of any class or any other
securities or property, or to receive any other right, the Company will give to
the holder of this Warrant, at least thirty (30) days prior to the date
specified therein, written notice specifying the date on which any such record
is to be taken for the purpose of such dividend, distribution or right, and the
amount and character of such dividend, distribution or right.

     15.  Miscellaneous.
          -------------

          (a) Issue Date.  The provisions of this Warrant shall be construed and
              ----------
shall be given effect in all respect as if it had been issued and delivered by
the Company on the date hereof.  This Warrant shall be binding upon any
successors or assigns of the Company.  This Warrant shall constitute a contract
under the laws of the State of California and for all purposes shall be
construed in accordance with and governed by the laws of said state.

          (b) Waivers and Amendments.  With the written consent of the Company
              ----------------------
and Holder, the obligations of the Company and the rights of Holder may be
waived (either generally or in a particular instance, either retroactively or
prospectively and either for a specified period of time of indefinitely), and
with the same consent the Company and Holder may enter into a supplementary
agreement for the purpose of adding any provisions to or changing in any manner
or eliminating any of the provisions of this Warrant.

          (c) Notices.  All notices and other communications required or
              -------
permitted to be given under this Warrant shall be in writing and shall be deemed
effectively given upon personal delivery, delivery by nationally recognized
courier or upon deposit with the United States Post Office (by first class mail,
postage prepaid) addressed as follows:  (i) if to the Company, to Inventa
Corporation, 255 Shoreline Drive, Suite 200, Redwood Shores, CA  94065,
Attention: _________________, and (ii) if to Holder, to Greyrock Capital, a
Division of Banc of America Commercial Finance Corporation, 10880 Wilshire
Blvd., Suite 1850, Los Angeles, CA  90024, Attention: ____________________.

                                      -8-
<PAGE>

          (d) Survival.  The provisions of Section 12 hereof shall survive the
              --------
exercise or conversion of this Warrant and shall remain in effect until such
time as Holder no longer holds Securities.

                                      -9-
<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated:  November 17, 1999

                     INVENTA CORPORATION

                     By: /s/ Ashok Santhanam
                        -----------------------------

                     Title: Chairman
                            -------------------------

Agreed and Accepted:

GREYROCK CAPITAL,

a Division of Banc of America Commercial
Finance Corporation

By:  /s/ Lisa Nagano
   -----------------------------------
         Lisa Nagano

Title: Sr. Vice President
       -------------------------------

                                      -10-
<PAGE>

                               NOTICE OF EXERCISE
                               ------------------

To:  Inventa Corporation

     (1) The undersigned hereby elects to purchase _______________ shares of
Series C Preferred Stock of Inventa Corporation pursuant to the terms of the
attached Warrant, and tenders herewith payment of the purchase price in full,
together with all applicable transfer taxes, if any.

     (2) Please issue a certificate of certificates representing said shares of
Series C Preferred Stock in the name of the undersigned or in such other name as
is specified below:

                         ---------------------------------------
                                          (Name)

                         --------------------------------------
                                         (Address)

     (3) The undersigned represents that the aforesaid shares of Series C
Preferred Stock are being acquired for the account of the undersigned for
investment and not with a view to, or for resale in connection with, the
distribution thereof and that the undersigned has no present intention of
distributing or reselling such shares.

------------------------------              ----------------------------------
          (Date)                            (Signature)
<PAGE>

                              NOTICE OF CONVERSION
                              --------------------

     To:  Inventa Corporation

     (1)  The undersigned hereby elects to convert the attached Warrant into
such number of shares of Series C Preferred Stock of Inventa Corporation as is
determined pursuant to Section 3 of such Warrant, which conversion shall be
effected pursuant to the terms of the attached Warrant.

     (2)  Please issue a certificate of certificates representing said shares of
Inventa Corporation Series C Preferred Stock in the name of the undersigned or
in such other name as is specified below:

                             --------------------------------
                                         (Name)

                             --------------------------------
                                        (Address)

     (3)  The undersigned represents that the aforesaid shares of Inventa
Corporation Preferred Stock are being acquired for the account of the
undersigned for investment and not with a view to, or for resale in connection
with, the distribution thereof and that the undersigned has no present intention
of distributing or reselling such shares.

------------------                     ----------------------------
    (Date)                             (Signature)
<PAGE>

                                ASSIGNMENT FORM
                                ---------------

                   (To assign the foregoing warrant, execute
                   this form and supply required information.
                   Do not use this form to purchase shares.)

     FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced thereby
are hereby assigned to

______________________________________________________________________________
                                 (Please Print)

whose address is _____________________________________________________________.
                                 (Please Print)

_____________________________________________________________________________

                                          Dated: _____________________, _____

                                          Holder's Signature: _______________

                                          Holder's Address: _________________

                                                            _________________

Signature Guaranteed: _______________________________________________________

NOTE:  The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatever, and must be guaranteed by a bank or trust company.  Officers of
corporations and those acting in a fiduciary or other representative capacity
should file proper evidence of authority to assign the foregoing Warrant.<PAGE>

                                                                    EXHIBIT 10.7

                              INVENTA CORPORATION

                             1993 STOCK OPTION PLAN

     1.   Purposes of the Plan. The purposes of this Stock Option Plan are to
          --------------------
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to Employees and Consultants of
the Company and its Subsidiaries and to promote the success of the Company's
business. Options granted under the Plan may be incentive stock options (as
defined under Section 422 of the Code) or non-statutory stock options, as
determined by the Administrator at the time of grant of an option and subject to
the applicable provisions of Section 422 of the Code, as amended, and the
regulations promulgated thereunder.

     2.   Certain Definitions. As used herein, the following definitions shall
          -------------------
apply:

          (a)  "Administrator" means the Board or any of its Committees
               -------------
appointed pursuant to Section 4 of the Plan.

          (b)  "Board" means the Board of Directors of the Company.
                -----

          (c)  "Code" means the Internal Revenue Code of 1986, as amended.
                ----

          (d)  "Committee" means the Committee appointed by the Board of
                ---------
Directors in accordance with paragraph (a) of Section 4 of the Plan.

          (e)  "Common Stock" means the Common Stock of the Company.
                ------------

          (f)  "Company" means Inventa Corporation, a California corporation.
                -------

          (g)  "Consultant" means any person, including an advisor, who is
                ----------
engaged by the Company or any Parent or Subsidiary to render services and is
compensated for such services, and any director of the Company whether
compensated for such services or not provided that if and in the event the
Company registers any class of any equity security pursuant to the Exchange Act,
the term Consultant shall thereafter not include directors who are not
compensated for their services or are paid only a director's fee by the Company.

          (h)  "Continuous Status as an Employee" means the absence of any
                --------------------------------
interruption or termination of the employment relationship by the Company or any
Subsidiary.  Continuous Status as an Employee shall not be considered
interrupted in the case of:  (i) sick leave; (ii) military leave; (iii) any
other leave of absence approved by the Board, provided that such leave is for a
period of not more than ninety (90) days, unless reemployment upon the
expiration of such leave is guaranteed by contract or statute, or unless
provided otherwise pursuant to Company policy adopted from time to time; or (iv)
in the case of transfers between locations of the Company or between the
Company, its Subsidiaries or its successor.
<PAGE>

          (i)  "Employee" means any person, including officers and directors,
                --------
employed by the Company or any Parent or Subsidiary of the Company. The payment
of a director's fee by the Company shall not be sufficient to constitute
"employment" by the Company.

          (j)  "Exchange Act" means the Securities Exchange Act of 1934, as
                ------------
amended.

          (k)  "Fair Market Value" means, as of any date, the value of Common
                -----------------
Stock determined as follows:

               (i)   If the Common Stock is listed on any established stock
exchange or a national market system including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported, as quoted
on such system or exchange for the last market trading day prior to the time of
determination) as reported in the Wall Street Journal or such other source as
the Administrator deems reliable;

               (ii)  If the Common Stock is quoted on the NASDAQ System (but not
on the National Market System thereof) or regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high and low asked prices for the Common Stock or;

               (iii) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Administrator.

          (l)  "Incentive Stock Option" means an Option intended to qualify as
                ----------------------
an incentive stock option within the meaning of Section 422 of the Code.

          (m)  "Nonstatutory Stock Option" means an Option not intended to
                -------------------------
qualify as an Incentive Stock Option.

          (n)  "Option" means a stock option granted pursuant to the Plan.
                ------

          (o)  "Optioned Stock" means the Common Stock subject to an Option.
                --------------

          (p)  "Optionee" means an Employee or Consultant who receives an
                --------
Option.

          (q)  "Parent" means a "parent corporation", whether now or hereafter
                ------
existing, as defined in Section 424(e) of the Code.

          (r)  "Plan" means this 1993 Stock Option Plan.
                ----

          (s)  "Share" means a share of the Common Stock, as adjusted in
accordance with Section 12 of the Plan.

          (t)  "Subsidiary" means a "subsidiary corporation", whether now or
                ----------
hereafter existing, as defined in Section 424(f) of the Code.

                                      -2-
<PAGE>

     3.   Stock Subject to the Plan.  Subject to the provisions of Section
          -------------------------
12 of the Plan, the maximum aggregate number of shares which may be optioned and
sold under the Plan is 5,355,000 shares of Common Stock.  The shares may be
authorized, but unissued, or reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan.

     4.   Administration of the Plan.
          --------------------------

          (a)  Procedure.
               ---------

               (i)   Administration With Respect to Directors and Officers.
                     -----------------------------------------------------
With respect to grants of Options to Employees who are also officers or
directors of the Company, the Plan shall be administered by (A) the Board if the
Board may administer the Plan in compliance with Rule 16b-3 promulgated under
the Exchange Act or any successor thereto ("Rule 16b-3") with respect to a plan
intended to qualify thereunder as a discretionary plan, or (B) a Committee
designated by the Board to administer the Plan, which Committee shall be
constituted in such a manner as to permit the Plan to comply with Rule 16b-3
with respect to a plan intended to qualify thereunder as a discretionary plan.
Once appointed, such Committee shall continue to serve in its designated
capacity until otherwise directed by the Board.  From time to time the Board may
increase the size of the Committee and appoint additional members thereof,
remove members (with or without cause) and appoint new members in substitution
therefor, fill vacancies, however caused, and remove all members of the
Committee and thereafter directly administer the Plan, all to the extent
permitted by Rule 16b-3 with respect to a plan intended to qualify thereunder as
a discretionary plan.

               (ii)  Multiple Administrative Bodies.  If permitted by Rule
                     ------------------------------
16b-3, the Plan may be administered by different bodies with respect to
directors, non-director officers and Employees who are neither directors nor
officers.

               (iii) Administration With Respect to Consultants and Other
                     ----------------------------------------------------
Employees.  With respect to grants of Options to Employees or Consultants who
---------
are neither directors nor officers of the Company, the Plan shall be
administered by (A) the Board or (B) a Committee designated by the Board, which
Committee shall be constituted in such a manner as to satisfy the legal
requirements relating to the administration of incentive stock option plans, if
any, of California corporate and securities laws and of the Code (the
"Applicable Laws").  Once appointed, such Committee shall continue to serve in
its designated capacity until otherwise directed by the Board.  From time to
time the Board may increase the size of the Committee and appoint additional
members thereof, remove members (with or without cause) and appoint new members
in substitution therefor, fill vacancies, however caused, and remove all members
of the Committee and thereafter directly administer the Plan, all to the extent
permitted by the Applicable Laws.

                                      -3-
<PAGE>

          (b)  Powers of the Administrator. Subject to the provisions of the
               ---------------------------
Plan and in the case of a Committee, the specific duties delegated by the Board
to such Committee, the Administrator shall have the authority, in its
discretion:

               (i)    to determine the Fair Market Value of the Common Stock, in
accordance with Section 2(k) of the Plan;

               (ii)   to select the officers, Consultants and Employees to whom
Options may from time to time be granted hereunder;

               (iii)  to determine whether and to what extent Options are
granted hereunder;

               (iv)   to determine the number of shares of Common Stock to be
covered by each such award granted hereunder;

               (v)    to approve forms of agreement for use under the Plan;

               (vi)   to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any award granted hereunder (including, but not
limited to, the share price and any restriction or limitation regarding any
Option or other award and/or the shares of Common Stock relating thereto, based
in each case on such factors as the Administrator shall determine, in its sole
discretion);

               (vii)  to determine whether and under what circumstances an
Option may be settled in cash under subsection 9(f) instead of Common Stock; and

               (viii) to reduce the exercise price of any Option to the then
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option shall have declined since the date the Option was granted.

          (c)  Effect of Committee's Decision. All decisions, determinations and
               ------------------------------
interpretations of the Administrator shall be final and binding on all Optionees
and any other holders of any Options.

     5.   Eligibility.
          -----------

          (a)   Nonstatutory Stock Options may be granted to Employees and
Consultants.  Incentive Stock Options may be granted only to Employees.  An
Employee or Consultant who has been granted an Option may, if he is otherwise
eligible, be granted an additional Option or Options.

          (b)  Each Option shall be designated in the written option agreement
as either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designations, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options designated as Incentive Stock
Options are exercisable for the first time by any Optionee during any calendar
year (under all plans of the Company or any Parent or Subsidiary) exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

                                      -4-
<PAGE>

          (c)  For purposes of Section 5(b), Incentive Stock Options shall be
taken into account in the order in which they were granted, and the Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such Shares is granted.

          (d)  The Plan shall not confer upon any Optionee any right with
respect to continuation of employment or consulting relationship with the
Company, nor shall it interfere in any way with his right or the Company's right
to terminate his employment or consulting relationship at any time, with or
without cause.

     6.   Term of Plan. The Plan shall become effective upon the earlier to
          ------------
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company as described in Section 18 of the Plan. It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 14 of the Plan.

     7.   Term of Option. The term of each Option shall be the term stated in
          --------------
the Option Agreement; provided, however, that in the case of an Incentive Stock
Option, the term shall be no more than ten (10) years from the date of grant
thereof or such shorter term as may be provided in the Option Agreement.
However, in the case of an Option granted to an Optionee who, at the time the
Option is granted, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the term of the Option shall be five (5) years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

     8.   Option Exercise Price and Consideration.
          ---------------------------------------

          (a)  The per share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the Board, but
shall be subject to the following:

               (i)   In the case of an Incentive Stock Option

                     (A)   granted to an Employee who, at the time of the grant
of such Incentive Stock Option, owns stock representing more than ten percent
(10%) of the voting power of all classes of stock of the Company or any Parent
or Subsidiary, the per Share exercise price shall be no less than 110% of the
Fair Market Value per Share on the date of grant.

                     (B)   granted to any Employee, the per Share exercise price
shall be no less than 100% of the Fair Market Value per Share on the date of
grant.

               (ii)  In the case of a Nonstatutory Stock Option

                     (A)   granted to a person who, at the time of the grant of
such Option, owns stock representing more than ten percent (10%) of the voting
power of all classes of stock of the Company or any Parent or Subsidiary, the
per Share exercise price shall be no less than 110% of the Fair Market Value per
Share on the date of the grant.

                     (B)   granted to any person, the per Share exercise price
shall be no less than 85% of the Fair Market Value per Share on the date of
grant.

                                      -5-
<PAGE>

          (b)  The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant) and may consist entirely of (1) cash, (2)
check, (3) other Shares which (x) in the case of Shares acquired upon exercise
of an Option either have been owned by the Optionee for more than six months on
the date of surrender or were not acquired, directly or indirectly, from the
Company, and (y) have a Fair Market Value on the date of surrender equal to the
aggregate exercise price of the Shares as to which said Option shall be
exercised, (4) authorization from the Company to retain from the total number of
Shares as to which the Option is exercised that number of Shares having a Fair
Market Value on the date of exercise equal to the exercise price for the total
number of Shares as to which the Option is exercised, (5) delivery of a properly
executed exercise notice together with irrevocable instructions to a broker to
promptly deliver to the Company the amount of sale or loan proceeds required to
pay the exercise price, (6) by delivering an irrevocable subscription agreement
for the Shares which irrevocably obligates the option holder to take and pay for
the Shares not more than twelve months after the date of delivery of the
subscription agreement, (7) any combination of the foregoing methods of payment,
or (8) such other consideration and method of payment for the issuance of Shares
to the extent permitted under Applicable Laws.  In making its determination as
to the type of consideration to accept, the Board shall consider if acceptance
of such consideration may be reasonably expected to benefit the Company (Section
315(b) of the California Corporation law).

     9.   Exercise of Option.
          ------------------

          (a)  Procedure for Exercise; Rights as a Shareholder. Any Option
               -----------------------------------------------
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 8(b) of the Plan.
Until the issuance (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a shareholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to
be issued) such stock certificate promptly upon exercise of the Option. No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 11 of the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

                                      -6-
<PAGE>

          (b)  Termination of Employment. In the event of termination of an
               -------------------------
Optionee's consulting relationship or Continuous Status as an Employee with the
Company (as the case may be), such Optionee may, but only within ninety (90)
days (or such other period of time as is determined by the Board, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option and not exceeding ninety (90) days) after the date of such
termination (but in no event later than the expiration date of the term of such
Option as set forth in the Option Agreement), exercise his Option to the extent
that Optionee was entitled to exercise it at the date of such termination.  To
the extent that Optionee was not entitled to exercise the Option at the date of
such termination, or if Optionee does not exercise such Option to the extent so
entitled within the time specified herein, the Option shall terminate.

          (c)  Disability of Optionee. Notwithstanding the provisions of Section
               ----------------------
9(b) above, in the event of termination of an Optionee's Consulting relationship
or Continuous Status as an Employee as a result of his total and permanent
disability (as defined in Section 22(e)(3) of the Code), Optionee may, but only
within twelve (12) months from the date of such termination (but in no event
later than the expiration date of the term of such Option as set forth in the
Option Agreement), exercise the Option to the extent otherwise entitled to
exercise it at the date of such termination. To the extent that Optionee was not
entitled to exercise the Option at the date of termination, or if Optionee does
not exercise such Option to the extent so entitled within the time specified
herein, the Option shall terminate.

          (d)  Death of Optionee.  In the event of the death of an Optionee, the
               -----------------
Option may be exercised, at any time within twelve (12) months following the
date of death (but in no event later than the expiration date of the term of
such Option as set forth in the Option Agreement), by the Optionee's estate or
by a person who acquired the right to exercise the Option by bequest or
inheritance, but only to the extent the Optionee was entitled to exercise the
Option at the date of death.  To the extent that Optionee was not entitled to
exercise the Option at the date of termination, or if Optionee does not exercise
such Option to the extent so entitled within the time specified herein, the
Option shall terminate.

          (e)  Rule 16b-3. Options granted to persons subject to Section 16(b)
               ----------
of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

          (f)  Buyout Provisions. The Administrator may at any time offer to buy
               -----------------
out for a payment in cash or Shares, an Option previously granted, based on such
terms and conditions as the Administrator shall establish and communicate to the
Optionee at the time that such offer is made.

     10.  Non-Transferability of Options. The Option may not be sold, pledged,
          ------------------------------
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     11.  Stock Withholding to Satisfy Withholding Tax Obligations.  At the
          --------------------------------------------------------
discretion of the Administrator, Optionees may satisfy withholding obligations
as provided in this paragraph.  When an Optionee incurs tax liability in
connection with an Option, which tax liability is subject to tax

                                      -7-
<PAGE>

withholding under applicable tax laws, and the Optionee is obligated to pay the
Company an amount required to be withheld under applicable tax laws, the
Optionee may satisfy the withholding tax obligation by electing to have the
Company withhold from the Shares to be issued upon exercise of the Option that
number of Shares having a Fair Market Value equal to the amount required to be
withheld. The Fair Market Value of the Shares to be withheld shall be determined
on the date that the amount of tax to be withheld is to be determined (the "Tax
Date").

          All elections by an Optionee to have Shares withheld for this purpose
shall be made in writing in a form acceptable to the Administrator and shall be
subject to the following restrictions:

          (a)  the election must be made on or prior to the applicable Tax Date;

          (b)  once made, the election shall be irrevocable as to the particular
Shares of the Option as to which the election is made;

          (c)  all elections shall be subject to the consent or disapproval of
the Administrator;

          (d)  if the Optionee is subject to Rule 16b-3, the election must
comply with the applicable provisions of Rule 16b-3 and shall be subject to such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

          In the event the election to have Shares withheld is made by an
Optionee and the Tax Date is deferred under Section 83 of the Code because no
election is filed under Section 83(b) of the Code, the Optionee shall receive
the full number of Shares with respect to which the Option is exercised but such
Optionee shall be unconditionally obligated to tender back to the Company the
proper number of Shares on the Tax Date.

     12.  Adjustments Upon Changes in Capitalization or Merger. Subject to
          ----------------------------------------------------
any required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

                                      -8-
<PAGE>

          In the event of the proposed dissolution or liquidation of the
Company, the Board shall notify the Optionee at least fifteen (15) days prior to
such proposed action.  To the extent it has not been previously exercised, the
Option will terminate immediately prior to the consummation of such proposed
action.  In the event of a merger of the Company with or into another
corporation, the Option shall be assumed or an equivalent option shall be
substituted by such successor corporation or a parent or subsidiary of such
successor corporation.  In the event that such successor corporation does not
agree to assume the Option or to substitute an equivalent option, the Board
shall notify the Optionee that the Option shall be exercisable for a period of
fifteen (15) days from the date of such notice, and the Option will terminate
upon the expiration of such period.

     13.  Time of Granting Options. The date of grant of an Option shall, for
          ------------------------
all purposes, be the date on which the Administrator makes the determination
granting such Option, or such other date as is determined by the Board. Notice
of the determination shall be given to each Employee or Consultant to whom an
Option is so granted within a reasonable time after the date of such grant.

     14.  Amendment and Termination of the Plan.
          -------------------------------------

          (a)  Amendment and Termination. The Board may at any time amend,
               -------------------------
alter, suspend or discontinue the Plan, but no amendment, alteration, suspension
or discontinuation shall be made which would impair the rights of any Optionee
under any grant theretofore made, without his or her consent. In addition, to
the extent necessary and desirable to comply with Rule 16b-3 under the Exchange
Act or with Section 422 of the Code (or any other applicable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain shareholder approval of any Plan amendment in such a manner
and to such a degree as required.

          (b)  Effect of Amendment or Termination. Any such amendment or
               ----------------------------------
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated, unless mutually agreed otherwise between the Optionee and
the Board, which agreement must be in writing and signed by the Optionee and the
Company.

     15.  Conditions Upon Issuance of Shares.  Shares shall not be issued
          ----------------------------------
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange upon which the Shares may
then be listed, and shall be further subject to the approval of counsel for the
Company with respect to such compliance.

          As a condition to the exercise of an Option, the Company may require
the person exercising such Option to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

                                      -9-
<PAGE>

     16.  Reservation of Shares. The Company, during the term of this Plan, will
          ---------------------
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

          The inability of the Company to obtain authority from any regulatory
body having jurisdiction, which authority is deemed by the Company's counsel to
be necessary to the lawful issuance and sale of any Shares hereunder, shall
relieve the Company of any liability in respect of the failure to issue or sell
such Shares as to which such requisite authority shall not have been obtained.

     17.  Agreements. Options shall be evidenced by written agreements in such
          ----------
form as the Board shall approve from time to time.

     18.  Shareholder Approval. Continuance of the Plan shall be subject to
          --------------------
approval by the shareholders of the Company within twelve (12) months before or
after the date the Plan is adopted. Such shareholder approval shall be obtained
in the degree and manner required under applicable state and federal law.

     19.  Information to Optionees. The Company shall provide to each Optionee,
          ------------------------
during the period for which such Optionee has one or more Options outstanding, a
balance sheet and an income statement at least annually. The Company shall not
be required to provide such information to key employees whose duties in
connection with the Company assure their access to equivalent information.

                                      -10-

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