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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without our prior written consent. You agree to refer guests and customers, wherever reasonably possible, only to System Hotels or Network Hotels. We may require you to participate in programs designed to refer prospective customers to Other Hotels. You must display all material, including brochures and promotional material we provide for System Hotels and Network Hotels, and allow advertising and promotion only of System Hotels and Network Hotels on the Hotel Site, unless we specifically direct you to include advertising or promotion of Other Hotels; 5.1.14 treat as confidential the Standards, the Manual and all other Proprietary Information. You acknowledge and agree that you do not acquire any interest in the Proprietary Information other than the right to utilize the same in the development and operation of the Hotel under the terms of this Agreement. You agree that you will not use the Proprietary Information in any business or for any purpose other than in the development and operation of the Hotel under the System and will maintain the absolute confidentiality of the Proprietary Information during and after the Term. You will not make unauthorized copies of any portion of the Proprietary Information; and will adopt and implement all procedures we may periodically establish in our business judgment to prevent unauthorized use or disclosure of the Proprietary Information, including restrictions on disclosure to employees and the use of non-disclosure and non-competition clauses in agreements with employees, agents and independent contractors who have access to the Proprietary information; 5.1.15 not become a Competitor, or permit your Affiliate to become a Competitor, in the upscale hotel market segment, or any substantially equivalent market segment, as determined by Smith Travel Research ("STR") (or, if STR is no longer in existence, STR's successor or other such industry resource that is as equally as reputable as STR); 5.1.16 own fee simple title (or long-term ground leasehold interest for a term equal to the Term) to the real property and improvements that comprise the Hotel and the Hotel Site, or alternatively, at our request, cause the fee simple owner, or other third party acceptable to us, to provide its guaranty covering all of your obligations under this Agreement in form and substance acceptable to us; 5.1.17 maintain legal possession and control of the Hotel and Hotel Site for the Term and promptly deliver to us a copy of any notice of default you receive from any mortgagee, trustee under any deed of trust, or ground lessor for the Hotel, and on our request, provide any additional information we may request related to any alleged default; 5.1.18 not directly or indirectly conduct, or permit by lease, concession arrangement or otherwise, gaming or casino operations in or connected to the Hotel or on the Hotel Site, or otherwise engage in any activity which, in our business judgment, is likely to adversely reflect upon or affect in any manner, any gaming licenses or permits held by the Entities or the then-current stature of any of the Entities with any gaming commission, board, or similar governmental or regulatory agency, or the reputation or business of any of the Entities; 10 5.1.19 not directly or indirectly conduct or permit the marketing or sale of timeshares, vacation ownership, fractional ownership, condominiums or like schemes at, or adjacent to, the Hotel. This restriction will not prohibit you from directly or indirectly conducting timeshare, vacation ownership, fractional ownership, or condominium sales or marketing at and for any property located adjacent to the Hotel that is owned or leased by you so long as you do not use any of the Marks in such sales or marketing efforts and you do not yse the Hotel or its facilities in such sales and marketing efforts or in the business operations of the adjacent property; 5.1.20 participate in and pay all charges related to our marketing programs (in addition to programs covered by the Monthly Program Fee), all guest frequency programs we require, and any optional programs that you opt into; 5.1.21 honor the terms of any discount or promotional programs (including any frequent guest program) that we offer to the public on your behalf, any room rate quoted to any guest at the time the guest makes an advance reservation, and any award certificates issued to Hotel guests participating in these programs; 5.1.22 after the Effective Date, maintain, at your expense, insurance of the types and in the minimum amounts we specify in the Standards. All such insurance must be with insurers having the minimum ratings
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Extract the exact clause related to "Non-Compete" from the excerpt above.

assistant: 5.1.15 not become a Competitor, or permit your Affiliate to become a Competitor, in the upscale hotel market segment, or any substantially equivalent market segment, as determined by Smith Travel Research ("STR") (or, if STR is no longer in existence, STR's successor or other such industry resource that is as equally as reputable as STR);