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:
"""
a prepayment of $1,900 and pay the remaining $3,100 on completion of the Scope of Work. 3. Business Hours; Rush Work. Company representatives are available during Company's normal business hours which are 9 a.m. to 5 p.m. UTC +2, Monday through Friday. Any email or telephone correspondence received after normal business hours will be processed the following business day. Client shall pay an additional surcharge for any services requiring work to be performed outside of normal business hours by reason of a rush deadline requested by Client or as a result of Client's failure to meet scheduled times for delivery and/or review and approval of information, content and materials. The surcharge for rush work shall be the standard hourly rate of $40 plus twenty-five percent (25%). 4. Customer Service. Company, either directly or through its authorized service provider, shall provide customer service (the "Customer Service") relating to Client Website consisting of replying to customer questions or complaints regarding website hosting services during the normal business hours set forth. Company is not obligated to provide any Customer Service except as specified in this Section. Company at its sole discretion may at any time alter or cease providing the Customer Service which it has agreed to provide to Client relating to Client Website pursuant to this Agreement without any liability to Company. AGREED AND ACCEPTED: Date: Jan. 11, 2018 Source: FREECOOK, S-1, 6/5/2018 By Company: /s/ Mitchell Vitalis Date: Jan. 11, 2018 Mitchell's Web Advance - Website Design, Development and Hosting Agreement Page 1 of 2 Client: /s/ Natalija Tunevic Company: /s/ Mitchell Vitalis Source: FREECOOK, S-1, 6/5/2018 Mitchell's Web Advance Website Design, Development and Hosting Agreement Exhibit A Scope of Work Development of design of Free Cook Stage 1: 1. Search for competitors, collecting additional information on the subject. 2. Development of unique style of the Client Website. 3. Development of a logo based on the unique corporate style. 4. Designing UI/UX-practical parts. 5. Development of the main and internal pages of the Client Website. Stage 2: 6. Emotional design (creation of web-assistants). 7. Adaptive design (mobile version of the Client Website). 8. Design adaptation to other languages. 9. Development of a prototype and interface testing. Stage 3: 10. Search Engine Optimization. Mitchell's Web Advance - Website Design, Development and Hosting Agreement Page 2 of 2 Client: /s/ Natalija Tunevic Company: /s/ Mitchell Vitalis Source: FREECOOK, S-1, 6/5/2018
"""

Extract the exact clause related to "Anti-Assignment" from the excerpt above.

assistant: Not found.