system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
The initial term of this Agreement shall be the Term, unless extended or earlier terminated in accordance with this Agreement. 2.2 Extensions. Unless this Agreement has been earlier terminated, at least eighteen (18) months prior to the expiration of the Term, M&I shall submit to Customer a written proposal for renewal of this Agreement. Customer will respond to such proposal within six (6) months following receipt and inform M&I in writing whether or not Customer desires to renew this Agreement. If M&I and Customer are unable to agree upon the terms for renewal of this Agreement at least six (6) months prior to the expiration of the Term, then Customer may, at its option, renew this Agreement for one (1) twelve month period at the then-current terms and conditions of this Agreement. Customer shall exercise its option, if at all, by delivering written notice to M&I at least five (5) months prior to expiration of the Term. 3. APPOINTMENT 3.1 Performance by M&I Affiliates. Customer understands and agrees that Marshall & Ilsley Corporation is a bank holding company and that the actual performance of the Services may be made by the divisions, subsidiaries and/or Affiliates of Marshall & Ilsley Corporation. For purposes of this Agreement, performance of the Services by any division, subsidiary or Affiliate of Marshall & Ilsley Corporation shall be deemed performance by Marshall & Ilsley Corporation itself. 3.2 Third Party Services. The parties acknowledge that certain services and information necessary for the performance of the Services may be provided by third parties. M&I agrees that the performance and warranties contained in this Agreement shall apply to the Initial Services even if the same are to be performed by third parties. Except as specifically stated in this Section 3.2, M&I shall have no liability to Customer for information supplied by, or services performed by, third parties in conjunction with the Services. 3.3 Proper Instructions. A. M&I shall be deemed to have received "Proper Instructions" upon receipt of written or oral instructions which M&I believes in good faith to be signed or given by any person(s) whose name(s) and signature(s) are listed on the most recent certificate delivered by Customer to M&I which lists those persons authorized to give orders, corrections and instructions in the name of and on behalf of Customer. B. Proper Instructions shall specify the action requested to be taken or omitted. Proper Instructions shall include instructions sent to M&I or its agent(s) by letter, memorandum, telegram, cable, telex, telecopy facsimile, video (CRT) terminal or other "on-line" system, or similar means of communication, or given orally over the telephone or in person by a person authorized by Customer pursuant to Section 3.4(A) to provide Proper Instructions. Proper Instructions shall include any file transmission received by M&I from Customer, or any agent of Customer who is thereof authorized in writing. 4. CONVERSION 4.1 Banking Applications. The parties agree to use their best efforts to perform the Conversion of all Banks to M&I's service bureau system on or before November 16, 1998. 4.2 Development of Conversion Plan. M&I has, in consultation with Customer, begun developing a detailed, customized plan for the Conversion (the "Conversion Plan"). The Conversion Plan includes (i) a description of the tasks to be performed for the Conversion; (ii) allocation of responsibility for each of such tasks; and (iii) the schedule on which each task is to be performed. The Conversion project leaders for each party shall regularly communicate on the progress of the Conversion, the feasibility of the Conversion Dates specified in the Conversion Plan, and such other matters which may affect the smooth transition of the Services. Customer agrees to maintain an adequate staff of persons who are knowledgeable with the systems currently used by Customer. Customer further agrees to provide such services and to perform such obligations as are specified as Customer's responsibility in the Conversion Plan and as necessary for Customer to timely and adequately meet the scheduled dates set forth therein. Customer also agrees to cooperate fully with all reasonable requests of M&I made necessary to effect the Conversion in a timely and efficient manner. The Conversion Plan (as it exists on the date of this Agreement and as it may be amended from time to time by the mutual agreement of the parties) is attached hereto as Schedule 4.2. Customer agrees to pay M&I for the costs of the Conversion in accordance with the provisions of Section 8.1. 4.3 Conversion Resources. M&I and Customer will provide a team of
"""

Extract the exact clause related to "Source Code Escrow" from the excerpt above.