Document:

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                                                                    Exhibit 4.19

                           MITEL NETWORKS CORPORATION

                     DEFERRED SHARE UNIT PLAN FOR EXECUTIVES

1.   INTRODUCTION

     1.1  PURPOSE

     The Mitel Networks Deferred Share Unit Plan For Executives has been
     established to provide executives with the opportunity to acquire deferred
     share units in order to allow them to participate in the long term success
     of Mitel Networks Corporation (the "Corporation") and to promote a greater
     alignment of interests between the executives and shareholders.

     1.2  DEFINITIONS

     For purposes of the Plan:

     (a)  "Annual Salary" means straight-time earnings excluding overtime, shift
          premiums, bonuses, special payments, marketing incentives and
          commissions except for commissions for those eligible employees who
          are targeted to receive at least 30% of total compensation through
          incentive based compensation.

     (b)  "Applicable Withholding Tax" has the meaning set forth in Section 2.3
          of the Plan;

     (c)  "Award Date" means each date on which Deferred Share Units are awarded
          to a Participant in accordance with Section 4.1;

     (d)  "Award Market Value" means (i) at any time prior to a Initial Public
          Offering and prior to the listing of the Shares on the TSX, the price
          for the Shares set by the Committee in good faith and (ii) following
          the Initial Public Offering and listing of the Shares on the TSX,
          means the weighted average trading price of the Shares on TSX on the
          five (5) trading days immediately preceding the Award Date;

     (e)  "Board" means the Board of Directors of the Corporation;

     (f)  "Committee" means the committee of the Board responsible for
          administering the Plan, which at the effective date of the Plan is the
          Compensation Committee;

     (g)  "Corporation" means Mitel Networks Corporation and its successors and
          assigns, and any reference in the Plan to activities by the
          Corporation means action by or under the authority of the Board or the
          Committee;

     (h)  "Deferred Share Unit" means a unit equivalent in value to a Share,
          credited by means of a bookkeeping entry in the books of the
          Corporation in accordance with Section 4;
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                                      -2-

     (i)  "Distribution Date" means (i) the date immediately following the date
          on which the Participant ceases to be an executive of the Corporation
          by way of voluntary or involuntary termination of employment with the
          Corporation or retirement (the "Separation Date"); or (ii) such later
          date as elected by the Participant, provided that in no event shall a
          Participant be permitted to elect a date which is later than the last
          business day of the calendar year following the calendar year in which
          the Separation Date occurs. An election for a Distribution Date
          described in (ii) above will only be valid if it is delivered to the
          general counsel of the Corporation prior to the Separation Date in the
          form prescribed for such purposes by the Corporation;

     (j)  "Distribution Value" means the weighted average trading price of the
          Shares on the TSX on the five (5) trading days immediately preceding
          the Distribution Date;

     (k)  "Dividend Equivalents" means a bookkeeping entry whereby each Deferred
          Share Unit is credited with the equivalent amount of the dividend paid
          on a Share in accordance with Section 4.2;

     (l)  "Dividend Market Value" means the weighted average trading price of
          the Shares on the TSX on the five (5) trading days immediately
          following the dividend record date for the payment of any dividend
          made on the Shares;

     (m)  "Initial Public Offering" means the initial offering of Shares to the
          public by the Corporation pursuant to a prospectus;

     (n)  "Participant" means an executive or former executive of the
          Corporation who has been or is eligible to be credited with Deferred
          Share Units under the Plan as designated by the Committee;

     (o)  "Plan" means the Mitel Networks Corporation Deferred Share Unit Plan
          For Executives, as amended from time to time;

     (p)  "Separation Date" has the meaning set forth in Section 1.2(h)(i) of
          the Plan;

     (q)  "Share" means a common share of the Corporation;

     (r)  "Supplementary Benefits Amount" has the meaning set forth in Section
          3.1; and

     (s)  "TSX" means the Toronto Stock Exchange.

     1.3  EFFECTIVE DATE OF THE PLAN

     The effective date of the Plan shall be July 1, 2004. The Committee shall
     review and confirm the terms of the Plan from time to time.
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                                      -3-

2.   ADMINISTRATION

     2.1  ADMINISTRATION OF THE PLAN

     Except for matters that are under the jurisdiction of the Board as
     specified under the Plan or as required by law: (a) the Plan shall be
     administered by the Committee, which shall have full authority to interpret
     the Plan, to establish, amend, and rescind any rules and regulations
     relating to the Plan, and to make such determinations as it deems necessary
     or desirable for the administration of the Plan; and (b) all actions taken
     and decisions made by the Committee in this regard shall be final,
     conclusive, and binding on all parties concerned, including, but not
     limited to, the Corporation, the Participants, and their legal
     representatives.

     2.2  DETERMINATION OF VALUE IF SHARES NOT PUBLICLY TRADED

     Should the Shares not be publicly traded on the TSX at the relevant time
     such that the Distribution Value and/or the Award Market Value and/or the
     Dividend Market Value cannot be determined in accordance with the formulae
     set out in the definitions of those terms, such values shall be determined
     by the Committee acting in good faith.

     2.3  TAXES AND OTHER SOURCE DEDUCTIONS

     The Corporation shall be authorized to deduct from any amount paid or
     credited hereunder such minimum amount of taxes and other minimum amounts
     as it may be required by law to withhold pursuant to applicable law, in
     such manner as it determines (the "Applicable Withholding Taxes").

     2.4  INFORMATION

     Each Participant shall provide the Corporation with all information it
     requires in order to administer the Plan.

3.   SUPPLEMENTARY BENEFITS AMOUNT

     3.1  DETERMINATION OF SUPPLEMENTARY BENEFITS AMOUNT

     As at December 31 each year, the Committee shall determine, with respect to
     each Participant, the amount equal to 15% of the Participant's Annual
     Salary for such year, less the maximum amount of eligible registered
     retirement savings plan contributions for the Participant (the
     "Supplementary Benefits Amount"), in order to determine the number of
     Deferred Share Units which may be awarded to each Participant for such
     year.

4.   DEFERRED SHARE UNITS

     4.1  NUMBER OF DEFERRED SHARE UNITS

     Each year following the determination of the Supplementary Benefits Amount
     in accordance with Section 3.1, the Committee may award Deferred Share
     Units to a Participant. Upon the determination of the Committee to award
     Deferred Share Units, the number of Deferred Share Units (including
     fractional Deferred Share Units) to be
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                                      -4-

     credited to a Participant as of the Award Date each calendar year shall be
     determined by dividing (a) the Supplementary Benefits Amount for such
     Participant for the applicable calendar year, by (b) the Award Market
     Value, with fractions computed to three decimal places. All Deferred Share
     Units received by a Participant shall be credited to an account maintained
     for the Participant on the books of the Corporation, as of the Award Date.
     The award of Deferred Share Units for a calendar year to a Participant
     shall be evidenced by an agreement in writing between the Participant and
     the Corporation in the form attached as Schedule "A".

     4.2  CREDITS FOR DIVIDENDS

     A Participant's account shall be credited with Dividend Equivalents in the
     form of additional Deferred Share Units on each dividend payment date in
     respect of which normal cash dividends are paid on the Shares. Such
     Dividend Equivalents shall be computed by dividing: (a) the amount obtained
     by multiplying the amount of the dividend declared and paid per Share by
     the number of Deferred Share Units recorded in the Participant's account on
     the record date for the payment of such dividend, by (b) the Dividend
     Market Value, with fractions computed to three decimal places.

     4.3  REPORTING OF DEFERRED SHARE UNITS

     Statements of the Deferred Share Unit accounts will be provided to the
     Participants on an annual basis.

     4.4  DISTRIBUTION OF DEFERRED SHARE UNITS

     A Participant shall receive, on the Distribution Date, a lump sum payment
     in cash having a value equal to the number of Deferred Share Units recorded
     in the Participant's account on the Distribution Date multiplied by the
     Distribution Value of a Share, less any Applicable Withholding Taxes. Upon
     payment in full of the value of the Deferred Share Units, the Deferred
     Share Units shall be cancelled and no further payments shall be made to the
     Participant under the Plan.

     4.5  DEATH OF PARTICIPANT PRIOR TO DISTRIBUTION

     Upon the death of a Participant prior to the distribution of the Deferred
     Share Units credited to the account of such Participant under the Plan, a
     lump sum payment in cash shall be made to the estate of such Participant on
     or about the thirtieth (30th) day after the Corporation is notified of the
     death of the Participant or on a later date elected by the Participant's
     estate, in the form prescribed for such purposes by the Corporation and
     delivered to the Corporate Secretary no later than twenty (20) days after
     the Corporation is notified of the death of the Participant, provided that
     such date is no later than the last business day of the calendar year
     following the calendar year in which the Participant dies. Such payment
     shall be equivalent to the amount which would have been paid to the
     Participant pursuant to and subject to Section 4.4, calculated on the basis
     that the day on which the Participant dies, or the date elected by the
     estate, as applicable, is the Distribution Date. Upon payment in full of
     the value of all of the Deferred Share Units that become payable under this
     Section 4.5, the Deferred Share Units shall be cancelled and no further
     payments will be made from the Plan in relation to the Participant.
<PAGE>
                                      -5-

     4.6  ADJUSTMENTS

     In the event of any change in the outstanding Shares by reason of a stock
     split, spin-off, share dividend, share combination or reclassification,
     recapitalization, merger, or similar event, the Committee may, subject to
     applicable law, adjust appropriately the account of each Participant and
     the Deferred Share Units outstanding under the Plan shall be adjusted in
     such manner, if any, as the Committee may in its discretion deem
     appropriate to preserve, proportionally the interests of Participants under
     the Plan.

5.   GENERAL

     5.1  AMENDMENT, SUSPENSION, OR TERMINATION OF PLAN

     The Committee may from time to time amend or suspend the Plan in whole or
     in part and may at any time terminate the Plan without prior notice.
     However, any such amendment, suspension, or termination shall not adversely
     effect the Deferred Share Units previously granted to a Participant at the
     time of such amendment, suspension or termination, without the consent of
     the affected Participant.

     If the Committee terminates the Plan no new Deferred Share Units (other
     than Deferred Share Units referred to in Section 4.2) will be credited to
     the account of a Participant, but previously credited Deferred Share Units
     shall be paid out in accordance with the terms and conditions of the Plan
     existing at the time of termination. The Plan will finally cease to operate
     for all purposes when the last remaining Participant receives payment of
     all Deferred Share Units recorded in the Participant's account.

     5.2  COMPLIANCE WITH LAWS

     (a)  The administration of the Plan shall be subject to and made in
          conformity with all applicable laws and any applicable regulations of
          a duly constituted authority. Should the Committee, in its sole
          discretion, determine that it is not feasible or desirable to award
          Deferred Share Units due to such laws or regulations, its obligation
          shall be satisfied by means of an equivalent cash payment (equivalence
          being determined on a before-tax basis).

     (b)  In the event that the Committee, after consultation with the
          Corporation's accountants, determines that it is not feasible or
          desirable to award Deferred Share Units or to honour any other
          provision of the Plan (other than the Distribution Date) under
          generally accepted accounting principles as applied to the Plan and
          the accounts established under the Plan for each Director, the
          Committee shall make such changes to the Plan as the Committee
          reasonably determines, after consultation with the Corporation's
          accountants, are required in order to avoid adverse accounting
          consequences to the Corporation with respect to the Plan and the
          accounts established under the Plan for each Director, and the
          Corporation's obligations under the Plan shall be satisfied by such
          other reasonable means as the Committee shall in its good faith
          determine.
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                                      -6-

     5.3  REORGANIZATION OF THE CORPORATION

     The existence of any Deferred Share Units shall not affect in any way the
     right or power of the Corporation or its shareholders to make or authorize
     any adjustment, recapitalization, reorganization or other change in the
     Corporation's capital structure or its business, or any amalgamation,
     combination, merger or consolidation involving the Corporation or to create
     or issue any bonds, debentures, shares or other securities of the
     Corporation or the rights and conditions attaching thereto or to effect the
     dissolution or liquidation of the Corporation or any sale or transfer of
     all or any part of its assets or business, or any other corporate act or
     proceeding, whether of a similar nature or otherwise.

     5.4  GENERAL RESTRICTIONS AND ASSIGNMENT

     Except as required by law, the rights of a Participant under the Plan are
     not capable of being anticipated, assigned, transferred, alienated, sold,
     encumbered, pledged, mortgaged or charged and are not capable of being
     subject to attachment or legal process for the payment of any debts or
     obligations of the Participant.

     Rights and obligations under the Plan may be assigned by the Corporation to
     a successor in the business of the Corporation.

     5.5  PARTICIPATION IN THE PLAN

     The participation of any Participant in the Plan is entirely voluntary and
     not obligatory and shall not be interpreted as conferring upon such
     Participant any rights or privileges other than those rights and privileges
     expressly provided in the Plan. In particular, neither participation in the
     Plan nor any action taken under the Plan constitutes a condition of
     employment or service or a commitment on the part of the Corporation to
     ensure the continued employment or service of such Participant. The
     Corporation does not assume responsibility for the personal income or other
     tax consequences for the Participants and they are advised to consult with
     their own tax advisors.

     5.6  NO SHAREHOLDER RIGHTS

     Under no circumstances shall Deferred Share Units be considered Shares nor
     shall they entitle any Participant to exercise voting rights or any other
     rights attaching to the ownership of Shares, nor shall any Participant be
     considered the owner of the Shares by virtue of the award of Deferred Share
     Units.

     5.7  UNITS NON-TRANSFERRABLE

     Deferred Share Units are non-transferrable (except to a Participant's
     estate as provided in Section 4.5) and certificates representing Deferred
     Share Units will not be issued by the Corporation.

     5.8  UNFUNDED AND UNSECURED PLAN

     Unless otherwise determined by the Committee, the Plan shall be unfunded
     and the Corporation will not secure its obligations under the Plan. To the
     extent any Participant
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                                      -7-

     or his or her estate holds any rights by virtue of a grant of Deferred
     Share Units under the Plan, such rights (unless otherwise determined by the
     Committee) shall be no greater than the rights of an unsecured creditor of
     the Corporation.

     5.9  NO OTHER BENEFIT

     No amount will be paid to, or in respect of, a Participant under the Plan
     to compensate for a downward fluctuation in the price of a Share, nor will
     any other form of benefit be conferred upon, or in respect of, a
     Participant for such purpose.

     5.10 GOVERNING LAW

     The Plan shall be governed by, and interpreted in accordance with, the laws
     of the Province of Ontario and the laws of Canada applicable therein,
     without regard to principles of conflict of laws.

     5.11 INTERPRETATION

     In this text words importing the singular meaning shall include the plural
     and vice versa, and words importing the masculine shall include the
     feminine gender.

     5.12 SEVERABILITY

     The invalidity or unenforceability of any provision of this Plan shall not
     affect the validity or enforceability of any other provision and any
     invalid or unenforceable provision shall be severed from this Plan.
<PAGE>
                                  SCHEDULE "A"

                           MITEL NETWORKS CORPORATION

                      FORM OF DEFERRED SHARE UNIT AGREEMENT

Personal & Confidential

[DATE]

[NAME OF EXECUTIVE]

Dear _____________:

It is with pleasure that I confirm that $__________ will be credited to your
account under the Mitel Networks Corporation Deferred Share Unit Plan for
Executives (the "Plan") in the form of Deferred Share Units.

This component of your remuneration recognizes your ongoing contributions to
Mitel Networks Corporation ("Mitel") and reinforces the alignment of the
interests of the executives and the shareholders.

In accordance with the terms of the Plan, all Deferred Share Units credited to
your account will be paid out at the time and in the manner specified in the
Plan.

If you have any questions on the above, or would like more details, please do
not hesitate to contact the Corporate Secretary's Office.

Would you please sign the enclosed copy of this letter and return it to the
Corporate Secretary, at Mitel Networks Corporation (in the attached
self-addressed envelope) by [date] to confirm your agreement with the foregoing
and your agreement to participate in the Plan in accordance with the terms of
the Mitel Networks Corporation Deferred Share Unit Plan for Executives.

Sincerely,

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

Encl.

I agree with the foregoing and agree to participate in the Mitel Networks
Corporation Deferred Share Unit Plan for Executives in accordance with its
terms.

Dated:
       ------------------------------   ----------------------------------------
                                        [NAME OF PARTICIPANT]<PAGE>
                                                                    EXHIBIT 4.24

                            SECOND AMENDING AGREEMENT

      MEMORANDUM OF AGREEMENT made as of the 7th day of February, 2005.

 BETWEEN:

                  MITEL NETWORKS CORPORATION,

                  a corporation incorporated under the laws of Canada, as
                  borrower

                  (hereinafter referred to as the "BORROWER")

                                        -and-

                  THE LENDERS FROM TIME TO TIME PARTIES TO THE CREDIT AGREEMENT,

                  (hereinafter referred to as the "LENDERS")

                                         -and-

                  BANK OF MONTREAL,

                  a Canadian chartered bank, as Administrative Agent and Lead
                  Arranger

                  (hereinafter referred to in its own capacity as "BMO" and in
                  its capacity as administrative agent on behalf of the Lenders,
                  as the "ADMINISTRATIVE AGENT").

            WHEREAS pursuant to an amended and restated credit agreement made as
of the 21st day of April, 2004 (the "ORIGINAL AGREEMENT"), a revolving credit
facility was made available to the Borrower upon and subject to the terms and
conditions therein set forth;

            AND WHEREAS the Borrower and Lenders made certain amendments to the
Original Agreement by an amending agreement dated as of July 24, 2004 (the
Original Agreement, as so amended, being hereinafter referred to as the "CREDIT
AGREEMENT");

            AND WHEREAS the Borrower and the Lenders have agreed to amend the
Credit Agreement by executing and delivering this Amending Agreement;

            NOW THEREFORE THIS AGREEMENT WITNESSES that, in consideration of the
premises, the covenants herein contained and other valuable consideration, the
parties hereto agree as follows:

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                                      -2-

l.    The Credit Agreement is hereby amended in the following respects:

      (a)   The definition of "Available Amount" in Section 1.1 of the Credit
            Agreement is deleted and replaced with the following:

            ""AVAILABLE AMOUNT" means, at any time, the lesser of:

            (a)   the Committed Amount or its Equivalent Amount in U.S. Dollars;

            (b)   the Borrowing Base; and

            (c)   (i)  if the Barclays Facility has been entered into, Cdn.
                       $20,000,000, or

                  (ii) if the Barclays Facility has not been entered into or
                       has been fully and finally terminated and repaid in full
                       and any security granted in connection therewith has been
                       released, Cdn. $25,000,000,

                  or, in each case, the Equivalent Amount in U.S. Dollars;";

      (b)   Section 1.1 of the Credit Agreement is amended by adding the
            following definition:

            ""BARCLAYS FACILITY" shall mean a working capital credit facility to
            be entered into between MNL and Barclays Bank plc in an aggregate
            amount not exceeding (pound)10,000,000 (including a (pound)10
            million chattel mortgage charging assets of MNL only to be granted
            by MNL in favour of Barclays Bank plc, as amended, restated,
            supplemented or replaced from time to time with the consent of the
            Required Lenders);";

      (c)   The definition of "Borrowing Base" in Section 1.1 of the Credit
            Agreement is deleted and replaced with the following:

            "BORROWING BASE" shall mean, at any time, the sum of:

            (i)   50% of Eligible Accounts Receivable; plus

            (ii)  90% of EDC Receivables; plus

            (iii) 100% of trade accounts of the Borrower and the Guarantors
                  which are secured by bank letters of credit or guarantee
                  satisfactory to the Required Lenders which bank letters of
                  credit or guarantees shall have been assigned to the
                  Administrative Agent if so requested by the Administrative
                  Agent;

            For purposes of calculating the Borrowing Base, Eligible Accounts
            Receivable and EDC Receivables of the Borrower and the Guarantors
            shall be expressed in

<PAGE>

                                       -3-

            Canadian Dollars based on the Equivalent Amount of the value of any
            such amounts in U.S. Dollars, Sterling or Euros;";

      (d)   The definition of "Permitted Debt" in Section 1.1 of the Credit
            Agreement shall be amended by adding the following paragraph
            immediately following paragraph (x) thereof:

            "(xi) Debt for borrowed money in an aggregate amount not exceeding
                  (pound)10,000,000 incurred pursuant the Barclays Facility;"

            and re-numbering subsequent paragraphs, and all references thereto,
            as appropriate to reflect such addition;

      (e)   Section 2.7(c) of the Credit Agreement is deleted in its entirety;

      (f)   Section 8.3 of the Credit Agreement is deleted and replaced with the
            following:

           "8.3  FINANCIAL COVENANT

                  The Borrower covenants and agrees with the Administrative
            Agent and the Lenders that, unless the Administrative Agent and the
            Required Lenders otherwise consent in writing, so long as any amount
            payable hereunder is outstanding, the Borrower shall not permit its
            EBTTDA (determined on a consolidated basis in accordance with GAAP
            as in effect on the date of this Agreement and measured as at the
            last day of each fiscal quarter of the Borrower for such fiscal
            quarter then ending, commencing with the fiscal quarter ending July
            25, 2004 and, to the extent that any assets or liabilities of
            Endurance Trust are included in the consolidated financial
            statements of the Borrower, calculated without reference to the
            assets and liabilities of Endurance Trust) to be less than the
            following amounts for the relevant fiscal quarter as set forth
            below:

            (i)   for the fiscal quarter ending July 25,2004, negative Cdn.
                  $5,000,000;

            (ii)  for the fiscal quarter ending October 24,2004, Cdn. $0.00;

            (iii) for the fiscal quarter ending January 23,2005, Cdn.
                  $3,000,000; and

            (iv)  for the fiscal quarter ending April 24,2005, negative U.S.
                  $5,000,000.";

      (g)   Section 8.4 is added to the Credit Agreement as follows:

            "8.4  RIGHT OF FIRST REFUSAL

            In consideration of the Lender agreeing to amend the credit
            facility, inter alia, to increase the Available Amount and to permit
            MNL to incur additional indebtedness in an amount up to
            (pound)10,000,000 to Barclays Bank plc, the Borrower

<PAGE>

                                       -4-

            covenants and agrees with the Lender that BMO Nesbitt Burns or any
            other affiliate of the Lender, in each case either alone or in
            combination with any other affiliate of the Lender, shall have a
            right of first refusal to act, at its option:

            (a)   as the lead in connection with any transaction undertaken in
                  Canada or as a co-lead and lead Canadian underwriter or agent
                  in connection with any transactions undertaken outside Canada
                  for both private and public offerings of equity or debt; and

            (b)   as an advisor on any sell-side M&A transaction involving asset
                  sales, including the sale of the company should a formal sales
                  process be initiated by the Borrower where an investment
                  banker is engaged to manage the sale process and seek
                  potential buyers, but excluding, at the Borrower's option,
                  responding to an unsolicited bid resulting from an
                  introduction from another investment bank or advisory firm.

            The rights of first refusal herein granted are conditional upon such
            underwriting and investment banking services being offered to the
            Borrower on terms and conditions (including price) which are
            generally consistent with then-current market terms and conditions
            for companies in similar industries and of similar size. The
            agreement of the Borrower under this Section 8.4 shall survive
            termination of this Agreement and shall remain in full force and
            effect as an enforceable obligation of the Borrower during the term
            of this Agreement and for a period of six months following the
            scheduled maturity of this Agreement."; and

      (h)   Section (xviii) of the definition of "Permitted Encumbrance" in
            Schedule F to the Credit Agreement is deleted and replaced with the
            following:

            "(xviii)Liens granted in connection with obligations incurred
                    pursuant to clause (x), (xi) or (xii) of the definition of
                    Permitted Debt;".

2. This Amending Agreement may be executed in counterparts, each of which shall
be considered an original and all of which taken together shall constitute a
single agreement.

3. This Amending Agreement shall be governed by the laws of the Province of
Ontario and the federal laws of Canada applicable therein.

4. The Credit Agreement, as amended, is hereby confirmed.

<PAGE>

                                       -5-

      IN WITNESS WHEREOF the parties hereto have executed this Amending
Agreement.

                                     MITEL NETWORKS
                                     CORPORATION

                                     by /s/ Steve Spooner
                                        ------------------------
                                        Name: Steve Spooner
                                        Title: C.F.O

                                     BANK OF MONTREAL, as
                                     Administrative Agent And Lead Arranger

                                     by /s/ Ashok Rao
                                        ------------------------
                                        Name: Ashok Rao
                                        Title: Vice President

                                     BANK OF MONTREAL, as Lender

                                     by /s/ Ashok Rao
                                        -------------------------
                                        Name: Ashok Rao
                                        Title: Vice President

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