Document:

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                                                                 Exhibit 10.21

THIS AGREEMENT is made on the 28 day of April 2000

BETWEEN

(1)      FIRSTMARK COMMUNICATIONS SERVICES EUROPE LIMITED, a company
         incorporated in the United Kingdom and having its registered address at
         1 James Street, Fourth Floor, London W1M 5HY, England (the "Company");
         and

(2)      TIMOTHY A. SAMPLES of 59 Frognal, Hampstead, London, NW3 6YA, England
         (the "Employee").

NOW IT IS HEREBY AGREED that the Company shall employ the Employee and the
Employee shall serve the Company as President and Chief Executive Officer, or in
such other capacity as may from time to time be mutually agreed, upon and
subject to the following terms and conditions:

1.       INTERPRETATION

1.1.     In this Agreement unless the context otherwise admits the following
         expressions shall have the meanings given to them as follows:

         "the Directors" means those members of the Board of Directors for the
         time being of the Company and "subsidiary" and "holding company" means
         a subsidiary or holding company as defined by Section 736 and 736A of
         the Companies Act 1985 for the time being of the Company (and
         "subsidiaries" and "holding companies" shall be construed accordingly);

         "associated company" means any holding company or subsidiary of the
         Company or any other subsidiary of such holding company;

1.2.     Any reference to a statutory provision shall be deemed to include a
         reference to any statutory modification or re-enactment of the same.

2.       COMMENCEMENT AND DURATION

2.1.     The Employee's employment with the Company shall commence as of
         February 2, 2000. No previous employment of the Employee shall be
         treated as being continuous with the Employee's employment with the
         Company.

2.2.     Subject to termination as hereinafter provided, the employment of the
         Employee shall continue from year to year provided that the Company may
         terminate the employment at any time by giving to the Employee six
         months written notice to terminate this Agreement and the Employee may
         terminate his employment at

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         any time by giving to the Company six months' written notice to
         terminate this Agreement.

2.3.     The Employee warrants to the Company that he is not restricted in any
         way from commencing and continuing employment with the Company on and
         after the date hereof. The Employee shall indemnify and keep
         indemnified the Company and each associated company against any and all
         damages, losses, costs and expenses (including the costs of any legal
         proceedings which the Company or any associated company may be party)
         arising from the Employee being in breach of the warranty contained in
         this sub-clause.

3.       REMUNERATION

3.1.     The Employee shall be entitled to a fixed salary at the rate of
         L200,000 (two hundred thousand UK pounds sterling) per annum
         (which shall accrue from day to day) payable by equal monthly
         installments in arrears on the last working day of every month.

3.2.     The first of such payments shall be made on the last day of the month
         in which the Employee's employment is deemed to have commenced and
         shall be a pro rata amount in respect of the period from the date
         hereof to the last day of such month.

3.3.     The Employee's salary shall be reviewed by the directors of the Company
         no later than, and with effect from, each anniversary of the Employee's
         employment with the Company, such review to be in line with the
         Company's then current policy on remuneration review; provided however,
         that the Employee's salary shall not be at a rate less than the rate in
         effect in the prior year unless such reduction occurs in connection
         with a Company wide salary expense reduction necessitated by poor
         financial performance of the Company as determined by the Directors of
         the Company in their reasonable discretion.

3.4.     The Company shall be entitled to deduct from the Employee's salary or
         from any other payments due to the Employee any amount which the
         Company is required by law to deduct (including without limitation PAYE
         or national insurance).

4.       BONUS

         The Company shall pay to the Employee a bonus in accordance with a
         bonus plan to be proposed by the Employee in his capacity as President
         and Chief Executive Officer which shall be subject to review and
         approval by the Directors of the Company; provided however, that the
         target bonus shall be 100% of the Employee's base salary with respect
         to the calendar year.

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5.       DEVOTION OF WHOLE TIME TO THE COMPANY

5.1.     During his employment with the Company the Employee shall, unless
         prevented by ill-health or holiday;

5.1.1.   perform such reasonable duties and exercise such powers, authorities
         and directions as the Directors may from time to time reasonably assign
         or vest in him in conjunction with the business of the Company and any
         one or more of the Company's associated companies;

5.1.2.   attend meetings of the senior management of the Company;

5.1.3.   devote his whole time and attention during normal working hours to the
         business of the Company and its associated companies and such other
         time as may be necessary for the performance of his duties hereunder;

5.1.4.   do all in his power to promote, develop and extend the business of the
         Company and its associated companies;

5.1.5.   conform to and comply with the reasonable directions and regulations
         made by the Directors or any other properly authorised person;

5.1.6.   not, without the previous consent in writing of a Director engage or be
         concerned or interested in any other business of a similar nature to or
         competitive with that carried on by the Company or any of its
         associated companies

PROVIDED always that nothing in this clause 5 shall preclude the Employee from
holding or being otherwise interested in any shares or other securities of (i)
any company which is for the time being quoted on any recognised stock exchange,
so long as the interest of the Employee therein does not without the written
consent of the Directors extend to more than 2.5% (two and one half percent) of
the aggregate amount of the quoted securities of any class in respect of such
company, or (ii) any privately held company, so long as the interest of the
Employee therein does not without the written consent of the Directors amount to
more than 5% (five percent) of the aggregate amount of securities of any class
in respect of such company, and the Employee does not participate in the
management or direction of such company.

5.2.     During the employment of the Employee with the Company:

5.2.1.   the Employee may be required, on a temporary basis, to work at such
         place or places in the United Kingdom or overseas as may be determined
         by the Company from time to time and undertake such travel overseas as
         may be reasonably required; and

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5.2.2.   the Employee shall report to the Board of Directors of the Company.

6.       BENEFITS

6.1.     The Employee shall be entitled to Company benefits available to senior
         executives, including but not necessarily limited to, use of a company
         automobile, health care, disability insurance, life cover and a
         contributory pension scheme.

6.2.     In respect of the benefits programme referred to in sub-clause 6.1, the
         Company shall pay the premiums in respect of private medical and dental
         expenses insurance effected on behalf of the Employee and the
         Employee's spouse as in accordance with Company policy. The Employee
         shall during his employment with the Company be a member of a
         death-in-service and disability benefit scheme maintained by the
         Company in respect of the Employee (or any scheme set up in its place).

7.       EXPENSES

         The Company shall pay or procure to be paid to the Employee all
         reasonable travel, hotel and other out-of-pocket expenses wholly
         exclusively and necessarily incurred by the Employee in the proper
         performance of his duties under this Agreement. Any such payment shall
         be subject to providing the Company with satisfactory receipts or other
         evidence of actual payment of said expenses.

8.       ABSENCE THROUGH ILLNESS

8.1.     In the case of illness of the Employee or other cause incapacitating
         him from properly performing his duties, the Employee shall, subject to
         clause 8.2, and to the production of such satisfactory medical evidence
         as the Company may reasonably require, continue to be paid his full
         salary during such absence.

8.2.     If such absence shall aggregate 16 (sixteen) weeks in any 52 (fifty
         two) consecutive weeks, the Company may terminate the employment of the
         Employee forthwith by written notice given within 28 (twenty eight)
         days of the end of the last 16 (sixteen) weeks. On termination pursuant
         to this clause 8.2, the Company shall pay to the Employee a sum equal
         to one year's salary from the date of such termination.

8.3.     The amounts payable by the Company to the Employee under this clause 8
         will be reduced by the amount of any statutory sick pay payable to the
         Employee.

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9.       HOLIDAYS

         The Employee shall (in addition to the usual Bank Holidays and public
         holidays) be entitled to 25 (twenty five) days paid holiday in each
         calendar year to be taken at a time or times mutually agreed with the
         Company.

10.      CONFIDENTIALITY AND NON-DISCLOSURE

10.1.    The Employee shall not either during his employment hereunder or at any
         time after its termination:

10.2.1   disclose to any person or persons (except those authorised by the
         Company to know);

10.2.2.  use for his own purpose or for any purposes other than those of the
         Company or its associated companies; or

10.2.3.  through any failure to exercise all due care and diligence cause any
         unauthorised disclosure of

any private, confidential or secret information of the Company (including lists
or details of customers of the Company or relating to the working of any process
or invention carried on or used by the Company or any invention of the Company)
or which he has obtained by virtue of his appointment or in respect of which the
Company is bound by an obligation of confidenee to a third party. These
restrictions shall cease to apply to information or knowledge which may
(otherwise than through default of the Employee) become available to the public
generally.

10.3.    The provisions of this clause 10 shall apply equally in relation to the
         private, confidential or secret information of any associated company
         of the Company which the Employee may have received or obtained during
         his appointment and the Employee shall upon request enter into an
         enforceable agreement with any such company to the like effect.

10.4.    All notes, memoranda, records and writing (in whatever format) made by
         the Employee relating to the business of the Company or any associated
         company of the Company, shall be and remain the property of the Company
         or the associated company to whose business they relate and shall be
         delivered by him to the company to which they belong forthwith upon
         request.

11.      SUMMARY TERMINATION

11.1.    The employment of the Employee hereunder may be terminated forthwith by
         the Company without payment in lieu of notice if the Employee:

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11.2.    is guilty of a felony involving moral turpitude, or of any gross
         misconduct in connection with or affecting the business of the Company
         or any of its associated companies; or

11.3.    is in material breach of any of the provisions of this Agreement unless
         the breach is capable of remedy and is not remedied within 7 (seven)
         days of notice by the Company requiring remedy; or

11.4.    commits an act of bankruptcy or becomes insolvent or suffers any
         similar or analogous action on account of debt.

11.5.    For purposes of this Agreement, the conditions described in sub-clauses
         11.2 and 11.3 shall constitute Cause.

11.6.    Except as provided in sub-clause 11.7, if within three (3) years from
         the date hereof, the Company terminates the employment of the Employee
         without Cause, or the Employee terminates for Good Reason, the Company
         shall pay the Employee within ten (10) days following such termination
         one (1) year base pay and bonus in an amount equal to the prior year's
         bonus (or, if there has been no prior year bonus, in an amount equal to
         100% of the Employee's base salary for the calendar year).

11.7.    If within two (2) years after a Change in Control (as defined below)
         the Company terminates the employment of the Employee without Cause, or
         the Employee terminates his employment for Good Reason, the Company
         shall pay the Employee within ten (10) days following such termination
         two (2) years base pay and two (2) years bonus. For this purpose, the
         Employee's bonus shall equal the greater of (i) the prior year's bonus,
         or (ii) the Employee's greatest bonus paid in any of the last three (3)
         years prior to the year in which the Change in Control occurs.

11.8.    For purposes of this Agreement, the following shall constitute "Good
         Reason" and the Company may regard the Employee's employment as being
         constructively terminated and the Employee may, therefore, resign
         within 30 days of discovery of the occurrence of one or more of the
         following events: (i) without the Employee's express written consent,
         the assignment to the Employee of any duties materially inconsistent
         with Employee's position, duties, responsibilities and status with the
         Company; (ii) without the Employee's express written consent, the
         termination and/or material reduction in the Employee's facilities
         (including office space and general location) and staff reporting
         available to the Employee unless such reduction occurs as part of a
         Company-wide action authorized by the Directors of the Company to
         reduce the Company's expenses; (iii) a material reduction by the
         Company of the

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         Employee's base salary or of any bonus compensation formula applicable
         to him unless in connection with a Company-wide salary expense
         reduction necessitated by poor financial performance of the Company as
         determined by the Directors of the Company in their reasonable
         discretion; (iv) the failure of the Company to obtain the assumption of
         this Agreement by any successor; (v) a material breach of any provision
         of this Agreement by the Company which is not earned within 10 business
         days after notice in writing by the Employee; or (vi) a material breach
         by any associated company of any provision of any other agreement
         relating to services, compensation or benefits of the Employee.

11.9.    A "Change in Control" shall have occurred when (i) any person or entity
         (other than persons controlling, controlled by or under common control
         with FirstMark Communications Europe S.A. ("FMCE")) shall have become
         the beneficial owner of equity interests representing more than 50% of
         the voting power of all outstanding equity securities of FMCE, (ii)
         FMCE shall have consummated any merger or consolidation if, as a result
         thereof, the shareholders of FMCE immediately prior to such transaction
         do not beneficially own equity interests representing more than 50% of
         the voting power of all outstanding equity securities of the resulting
         or surviving entity or its parent entity, or (iii) FMCE shall have sold
         all or substantially all of its consolidated assets.

12.      RECONSTRUCTION

         If the employment of the Employee is terminated by reason of the
         liquidation of the Company for the purpose of reconstruction or
         amalgamation, the Employee shall be offered employment with any concern
         or undertaking resulting from such reconstruction or amalgamation on
         terms and conditions no less favourable than the terms of this
         Agreement. The Employee shall in such circumstances have no claim
         against the Company in respect of the termination of his employment.

13.      EFFECT OF TERMINATION

13.1.    The termination of the Employee's employment in accordance with the
         terms of this Agreement howsoever occasioned shall not prejudice any
         claim which either party may have against the other in respect of any
         antecedent breach of any provision of this Agreement, nor shall it
         prejudice the continuance in force of any provision which is, expressly
         or by implication, intended to come into, or continue in force on or
         after such termination.

13.2.    Upon the termination for whatever reason of the Employee's employment
         hereunder, the Employee shall thereafter, upon the request of the
         Company:

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13.2.1.  Resign without claim for compensation from office of the Company and
         such other offices held by him in the Company or any of its
         subsidiaries or associated companies as may be so requested. In the
         event of the Employee's failure to do so forthwith upon request, the
         Company is hereby irrevocably authorised to appoint some person in his
         name and on his behalf sign and deliver such resignation or
         resignations to the Company and to each subsidiary or associated
         company of the Company of which the Employee is at the material time an
         officer; and

13.2.2.  Hand over to the Company or as it may direct and without retaining
         copies of the same all documents, books, correspondence and other
         papers of whatsoever nature relating to the business of the Company and
         any of its associated companies which may then be or ought to be in his
         possession.

14.      PAY IN LIEU OF NOTICE

         On serving notice for any reason to terminate this Agreement the
         Company shall instead of giving the Employee the appropriate period of
         notice be entitled (at its sole discretion) to pay to the Employee his
         salary and full contractual benefits (at the rate then current) for the
         appropriate period of notice of such termination.

15.      LEAVE OF ABSENCE

15.1.    On serving notice for any reason to terminate this Agreement the
         Company may (at its sole discretion) require the Executive to take paid
         leave of absence equal in length of time to the Employee's entitlement
         to notice of such termination.

15.2.    Whilst on such leave of absence the Employee shall not, without the
         Company's prior written consent, or at the Company's request, contact
         any Company employee, customer or supplier of the Company.

16.      GRIEVANCE AND DISCIPLINARY PROCEDURES

         There is no formal disciplinary procedure applicable to this Agreement.
         Should the Employee have a grievance this should be discussed with the
         Directors of the Company.

17.      SEVERABILITY

         Each and every provision in this Agreement shall be read as a separate
         and distinct undertaking and the invalidity, legality or
         unenforceability of any part of this Agreement shall not affect the
         validity, legality or enforceability of the remainder.

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18.      WAIVER

         No waiver by the Company or the Employee of any of their respective
         rights hereunder shall be deemed a continuing waiver of any such rights
         hereunder.

19.      ASSIGNMENT

         The Company shall be entitled to assign its rights under this Agreement
         to a transferee of substantially all the assets of the Company or to
         any of its associated companies by whom the Employee shall for the time
         being be employed or on behalf of which he shall at any time work and
         the Employee agrees to accept any such assignment so long as there is
         no diminution of his responsibilities.

20.      NOTICES

20.1.    Any notice to be given under this Agreement shall be sufficiently
         served:

20.2.    In the case of the Employee by being delivered either personally to him
         or sent by registered post or recorded delivery to his usual or last
         known residential address in the United Kingdom; and

20.3.    In the case of the Company by being personally delivered at or sent by
         registered post or recorded delivery addresses to its registered
         office.

20.4.    Any such notice on sub-clauses 20.2 and 20.3 shall be deemed served on
         the second day following that on which it was posted.

21.      GOVERNING LAW

         This Agreement shall be subject to English law and the parties hereby
         agree to and submit to the non-exclusive jurisdiction of the English
         courts.

22.      PREVIOUS AGREEMENTS

22.1.    This Agreement supersedes all existing agreements, arrangements,
         contracts, representations and understandings (oral and written) for
         the employment of the Employee by the Company.

22.2.    The Employee hereby acknowledges that he has no outstanding claims of
         any kind against the Company or its associated companies.

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23.      POST-TERMINATION RESTRICTIONS

23.1.    The Employee shall not during the course of his employment with the
         Company, and for a period of 12 (twelve) months after termination of
         his employment with the Company or any associated company, be engaged
         as a director, officer, employee or consultant in any concern which,
         directly or through any subsidiary or joint venture, (x) is or shall be
         wholly or partly in competition with any aspect of the Company's or any
         of its subsidiaries' or joint ventures' business in any jurisdiction in
         which the Company, directly or through any of its subsidiaries or joint
         ventures, operates or intends to operate or apply for a wireless local
         loop or DSL license within such 12 (twelve) months or (y) is applying
         or intends to apply for a wireless local loop or DSL license in any
         jurisdiction in which the Company or any of its subsidiaries or joint
         ventures holds or intends to apply for a wireless local loop or DSL
         license.

23.2.    The Employee agrees that he shall not, for a period of 12 (twelve)
         months after termination of his employment with the Company, solicit or
         entice away or seek to entice away from the employment of the Company
         or any of its associated companies or any of their subsidiaries or
         joint ventures any person who is or was at the date of the Employee's
         termination of employment employed by the Company or any associated
         company or any of their subsidiaries or joint ventures in a senior
         managerial, technical, supervisory, sales or marketing capacity.

23.3.    The Employee agrees that he shall not, for a period of 12 (twelve)
         months after termination of his employment with the Company or any
         associated company, solicit any customer of the Company or its
         associated companies or any of their subsidiaries or joint ventures to
         terminate or modify adversely to the Company or any associated company
         or any of their subsidiaries or joint ventures its business
         relationship with the Company or any associated company or any of their
         subsidiaries or joint ventures.

24.      DATA PROTECTION

         The Employee acknowledges and agrees that the Company is permitted to
         hold personal information concerning the Employee and that the Company
         may make use of such information in the course of the Company's normal
         business activities. The Employee further acknowledges and agrees that
         the Company may disclose such information to its associated companies
         and certain third parties in such circumstances where disclosure is
         necessary to ensure the proper conduct of the Company's business or the
         business of any of its associated companies. Personal information as
         referred to in this clause 24 may be held, used or disclosed as
         aforesaid in any medium whatsoever.

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25.      INTELLECTUAL PROPERTY

         The Employee shall disclose promptly to the Company any invention or
         intellectual property discovered or created by the Employee during the
         period of his employment with the Company, insofar as any discovery or
         creation relates to the business of the Company or the business of any
         associated company, and any such invention or other intellectual
         property so created shall (subject to the Patents Act 1977) belong to
         and be the absolute property of the Company. The Employee shall,
         whether during or after termination of his employment (howsoever
         arising) do all such things, execute all such documents and take any
         action required by the Company (at the Company's cost) to apply for
         protection in respect of any invention or other intellectual property
         and to vest the same in the Company or in any associated company.

26.      SHAREHOLDER APPROVAL

         All terms and conditions of this Agreement are subject to the approval
         of those persons who own more than 75% of the voting power of all the
         outstanding interests of the Company in accordance with Section 280G of
         the Internal Revenue Code of 1986, as amended, under U.S. law, and
         regulations thereunder.

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AS WITNESS the hands of the parties hereto the day and year first above written

Signed by
For and on behalf of
FIRSTMARK COMMUNICATION SERVICES EUROPE LIMITED
In the presence of

/s/ Timothy A. Samples
-------------------------------
Signed by TIMOTHY A.  SAMPLES
In the presence of

                                      -12-<PAGE>
                                                                 Exhibit 10.22
                                                                EXECUTION COPY

                                 PROMISSORY NOTE

$1,000,000                                        Effective date: May 11, 2000

         FOR VALUE RECEIVED, Timothy A. Samples (the "MAKER") does hereby
promise to pay to FirstMark Communications Europe SA ("FMCE") or its assigns
(the holder of this promissory Note being referred to as the "HOLDER"), the
principal sum of One Million Dollars and No Cents.

1.   PAYMENT. Subject to Section 2 below, all sums payable hereunder shall be
collected from the Maker by the Holder by means of a check or money order made
payable to the Holder at 1 James Street, Fourth Floor, London, England W1M 5HY
or at such other place or places as the Holder may direct from time to time, in
United States dollars. The principal balance of this Promissory Note shall be
paid (i) in five annual payments to the Holder in the amount of $200,000 (the
"INSTALLMENT PAYMENT"), with the first Installment Payment due and payable on
February 2, 2001, and each of the next four (4) Installment Payments due and
payable on each succeeding February 2 (each payment date referred to herein as
the "INSTALLMENT DATE"). Notwithstanding the foregoing, all amounts shall be due
and payable immediately in the event that the Employee is terminated by
FirstMark Communications Services Europe Limited (or its successor) for Cause or
terminates his employment other than for Good Reason, or, subject to Section 2
below, one year after termination of employment for any other reason.

2.   FORGIVENESS. (a) If, as of an Installment Date, the Maker continues to be
President and Chief Executive Officer of FirstMark Communications Services
Europe Limited (or its successor), the Holder shall forgive the Installment
Payment due and payable as of such Installment Date, and FMCE shall treat the
forgiveness as compensation to Mr. Samples; provided, however, that as a
condition to such forgiveness, the Maker shall make arrangements that are
satisfactory to the directors of FMCE in their sole discretion with respect to
the Maker's payment to FMCE of the amount that is necessary to be withheld (if
any) in accordance with applicable withholding requirements.

                  (b) Upon a Change in Control (as defined below), the Holder
shall forgive any remaining Installment Payments. FMCE shall treat the
forgiveness as compensation to the Maker; provided, however, that as a condition
to the forgiveness, the Maker shall make arrangements that are satisfactory to
the directors of FMCE in their sole discretion with respect to the Maker's
payment to FMCE of the amount that is necessary to be withheld (if any) in
accordance with applicable withholding requirements.

                  (c) A "Change in Control" shall have occurred when (i) any
person or entity (other than persons controlling, controlled by or under common
control with

<PAGE>

FMCE) shall have become the beneficial owner of equity interests representing
more than 50% of the voting power of all outstanding equity securities of FMCE,
(ii) FMCE shall have consummated any merger or consolidation if, as a result
thereof, the shareholders of FMCE immediately prior to such transaction do not
beneficially own equity interests representing more than 50% of the voting power
of all outstanding equity securities of the resulting or surviving entity or its
parent entity, or (iii) FMCE shall have sold all or substantially all of its
consolidated assets.

3.   PREPAYMENT. This Promissory Note is subject to prepayment at any time or
from time to time at the option of the Maker, either in whole or in part,
without premium or penalty.

4.   DELINQUENCY RATE OF INTEREST. All past due and delinquent sums hereunder,
both principal and interest, shall earn interest until such sums have been paid
at the rate that is the lesser of (A) 12% or (B) the maximum rate of interest
permitted by applicable law. Interest shall be computed on the basis of a 365
day year for the actual number of days elapsed.

5.   COLLECTION EXPENSES. If there is a default under this Promissory Note and
this Promissory Note is placed in the hands of an attorney for collection, or in
the event that this Promissory Note is collected in whole or in part by suit or
through probate or bankruptcy proceedings, or other legal proceedings of any
kind, the Maker agrees to pay, in addition to all the sums payable hereunder,
the Holder's reasonable expenses of collection, including, without limitation,
reasonable attorneys' fees and disbursements, whether or not suit is brought and
through all appeals.

6.   GENERAL PROVISIONS. Time shall be of the essence with respect to the terms
of this Promissory Note. This Promissory Note cannot be changed or modified
orally.

7.   GOVERNING LAW. This Promissory Note shall be construed in accordance with
and governed by English law.

8.   SHAREHOLDER APPROVAL. All terms and conditions of this Agreement are
subject to the approval of those persons who own more than 75% of the voting
power of all the outstanding interests of FMCE in accordance with
Section 280G of the Internal Revenue Code of 1986, as amended, under U.S. law
and regulations thereunder.

9.   DEFINITIONS. For purposes of this Promissory Note, the terms "Cause" and
"Good Reason" shall have the meanings set forth in the Employment Agreement
dated the date hereof between FirstMark Communications Europe Services Limited
and the Maker.

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         EXECUTED this 11th day of May, 2000, to be effective as of the date
first set forth above.

                                                MAKER: /s/ Timothy A. Samples
                                                      ------------------------
                                                TIMOTHY A. SAMPLES

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