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:
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required by the Franchise Agreement; or (ix) If Franchisee operates the franchise in such a manner so as to affect materially and adversely the goodwill or reputation of Pretzel Time or its System or any product manufactured by any Affiliate; or (x) Franchisee denies Pretzel Time the right to inspect the Unit or to examine or audit his books; or (xi) Franchisee misuses Pretzel Time's Marks or asserts any interest in Pretzel Time's Marks; uses Pretzel Time's tradename or any part thereof as part to of its corporate name; does not cooperate in the enforcement of any Mark; or challenges or seeks to challenge the validity of the Marks; or (xii) Franchisee fails to maintain and operate the Unit in accordance with standards and specifications established by Pretzel Time as to the services or maintenance of inventory; or (xiii) Franchisee fails to obtain all permits, insurance, licenses and other necessary documents for the opening of the Unit; or (xiv) Franchisee fails to maintain uniform Unit design and image, and/or fails to refurbish or remodel as required by Pretzel Time; or (xv) Franchisee attempts or does mortgage, pledge or otherwise assign as security the premises, any equipment, furnishings, fixtures or any interest Franchisee may have; or (xvi) Conduct by Franchisee which is of such a nature that a reasonably objective person would consider same to be deleterious to or to reflect unfavorably on Pretzel Time or the Pretzel Time Unit System; or (xvii) Failure by Franchisee to maintain a responsible credit rating by failing to make prompt payment of undisputed bills, invoices and statements from suppliers or distributors of goods and services to the Unit; or (xviii) Failure to comply with all of the terms of the Operations Manual as amended from time to time, the standards and specifications required by Pretzel Time or any other agreement between the Franchisee and Pretzel Time; or (xix) Fails to pay any federal or state income, sales or other taxes due on the Unit's operations unless Franchisee is in good faith contesting his liability for such taxes; or (xx) Franchisee knowingly sells any product or service that does not conform to Pretzel Time's specifications, uses or sells products other than in strict accordance with the requirements of the Franchise Agreement or the Operations Manual; fails to sell products or services approved by Pretzel Time or deals with vendors and suppliers not approved by Pretzel Time. (xxi) Franchisee fails to pay any subcontractor, contractor or other person to whom money is due and that subcontractor, contractor or other person demands said money from Pretzel Time. (xxii) Franchisee is late in paying rent to the landlord more than 2 times in any twleve month period. 19.F. EVENTS OF DEFAULT - IMMEDIATE TERMINATION - NO RIGHT TO CURE. The following acts of default will result in termination of the Franchise effective immediately upon delivery and receipt of written notice of same to Franchisee and with no right to cure where the grounds for termination or cancellation are: (i) Franchisee or a Owner fails to complete all phases of the initial training program to Pretzel Time's satisfaction; or (ii) Franchisee fails to commence operation of the Unit within the time specified in this Agreement; or (iii) Any affirmative act of bankruptcy or insolvency by Franchisee, or the filing by Franchisee of any petition or action in bankruptcy or insolvency, or for appointment of a receiver or trustee, Franchisee admits in writing his inability to pay his debts or an assignment by Franchisee for the benefit of creditors, or the failure to vacate or dismiss within five (5) days after filing any such proceedings commenced against Franchisee by a third party. Franchisee expressly and knowingly waives any rights that he may have under the provisions of the Bankruptcy Rules and consents to the termination of this Agreement or any other relief which may be sought in a complaint filed by Pretzel Time to lift the provisions of the automatic stay of the Bankruptcy Rules. Additionally Franchisee agrees not to seek an injunction order from any court in any jurisdiction relating to insolvency, reorganization of arrangement proceedings which would have the effect of staying or enjoining this provision. THIS PROVISION MAY NOT BE ENFORCEABLE UNDER FEDERAL BANKRUPTCY LAW (11 U.S.C.A. Sec. 101 et seq.); or (iv) Failure to cure within seventy-two (72) hours after delivery of written notice of default under the Franchise Agreement which materially impairs the goodwill associated with Pretzel Time's trade names, trademarks, service marks, logo types
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Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.

assistant: (xi) Franchisee misuses Pretzel Time's Marks or asserts any interest in Pretzel Time's Marks; uses Pretzel Time's tradename or any part thereof as part to of its corporate name; does not cooperate in the enforcement of any Mark; or challenges or seeks to challenge the validity of the Marks;