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 Originators and forwards the entries to the ACH Operator. 4. "Originator" means a person that has authorized an ODFI to transmit a credit or debit entry to the deposit account of an RDFI. 5. "Receiving Depository Financial Institution" means the institution that receives ACH entries from the ACH Operator and posts them to the accounts of its depositors. B. General. Customer hereby authorizes M&I to initiate and receive automated clearing house ("ACH") debit entries, adjustments to debit entries and credit entries to Customer's account indicated below, to credit and/or debit the same to such account, and to provide various ACH services, as described below, to Customer pursuant to the terms and conditions specified herein. The ACH entries covered shall hereinafter be referred to as the "ACH Entries." Except as otherwise provided herein, the terms used in this Section 6.5 shall have the same meanings as ascribed to such terms in the Operating Rules of the National Automated Clearing House Association, as in effect from time to time (the "NACHA Rules"). C. ACH Services. 1. M&I shall act as Customer's agent for initiating and transmitting ACH Entries to the appropriate ACH Operator. In addition, M&I shall act as Customer's agent for receiving ACH Entries from an ACH Operator. For all ACH Entries initiated by M&I pursuant to this Agreement, Customer, and not M&I, shall be the ODFI when M&I receives payment instructions directed to Customer's routing number from an Originator, or the RDFI when M&I receives ACH Entries directed to Customer's routing number from an ACH Operator. 2. M&I shall transmit ACH Entries in accordance with the format requirements of the NACHA Rules to an ACH Operator using Customer's Routing Number. M&I shall receive ACH Entries on behalf of Customer that are transmitted to M&I by an ACH Operator. M&I shall provide reports to Customer, as described in the M&I ACH Manual (the "Service Manual"). If agreed to between Customer and M&I, M&I shall provide for the posting of ACH Entries to Customer deposit accounts. 3. All warranties of an ODFI or RDFI prescribed under Applicable Law shall be in effect and applicable to Customer, and not M&I, with respect to all ACH Entries. 4. M&I may provide additional ACH services as requested by Customer and agreed to by M&I in writing. D. M&I PC ACH Services. Customer may provide its business depositors with access to M&I's ACH Services as provided in M&I's PC ACH User Manual (the "PC ACH Service"). Customer shall be responsible for informing M&I prior to permitting a new depositor to begin using the PC ACH Service. Customer also shall inform M&I whether any credit limit shall apply to the ACH Entries of a depositor utilizing the PC ACH Service. E. Customer Depositor Inquiries; Erroneous or Rejected ACH Entries. 1. Customer shall be responsible for handling all inquiries of its depositors regarding ACH Entries, including but not limited to inquiries regarding credits or debits to a depositor's account resulting from an ACH Entry. M&I agrees to reasonably assist Customer in responding to such inquiries by providing information to Customer concerning ACH Entries. 2. As described in the Service Manual, M&I shall provide reports to Customer showing errors and rejections resulting from ACH Entries transmitted on behalf of Customer during a particular day. It shall be Customer's responsibility to research and correct such ACH Entries. F. Credit Limits. 1. Customer may from time to time establish one or more credit limits applicable to ACH Entries involving a particular depositor or all depositors of Customer. Such credit limits may be established by written notice from Customer and shall be implemented by M&I as soon as reasonably practicable. 2. In the event that an ACH Entry exceeds a credit limit established pursuant to this Section 6(F), M&I shall promptly give oral or written notice to Customer. Customer may either approve the ACH Entry as an exception to the credit limit, request that it be held over to the next day, or reject such ACH Entry provided, however, that any exception to the credit limit must be approved in writing by Customer. G. Service Manuals; PC ACH User Manual. 1. M&I shall provide Customer with copies of M&I's current Service Manual and PC ACH User Manual and any updates to such manuals. Customer agrees to comply with the requirements of such manuals. 2. It shall be Customer's responsibility, and Customer is authorized, to forward a copy of the PC ACH User Manual, and any updates to the PC ACH User
"""

Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.