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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Exhibit 10.4 COOPERATION AGREEMENT (2014 Amendment) This Cooperation Agreement (2014 Amendment) (this "Agreement") is entered into on January 24, 2014 in Beijing by and between: (1) Nanjing Tuniu Technology Co., Ltd., with its registered address at 3-5/F Building No.6, Southeast University Science Park, 6 Changjianghou Street, Xuanwu District, Nanjing and its legal representative being Yu Dunde ("Party A"); (2) Beijing Tuniu Technology Co., Ltd., with its registered address at R1006 10/F Building No.4, Yard No.1 of Shangdishi Street, Haidian District, Beijing and its legal representative being Yu Dunde ("Party B"). WHEREAS 1. Party A is a company with exclusively domestic capital incorporated under the laws of the People's Republic of China, mainly engaged in the internet-based sale, promotion of tour products, room reservation and conference affairs services. 2. Party B is a limited liability company incorporated under the laws of the People's Republic of China, mainly engaged in research and development of computer software technology, technology transfer, technical consultancy and technical services, computer technology training, technical services and business consultancy services in relation to the internet-based sale and promotion of tour products. 3. Party A intends to authorize Party B to provide to Party A and its subsidiaries the technical services and business consultancy services in relation to the internet-based sale and promotion of tour products, including but not limited to development, operation, maintenance of internet technology platform as well as consultancy services relating to sale and promotion of tour products or cooperation provided by Party B in other forms as required under this Agreement, and Party B agrees to accept such authorization. 4. After an amiable consideration, the Parties unanimously agree that the establishment of a long-term and close cooperation relationship is in the best interests of the Parties and their beneficiaries. 5. The Parties have entered into the Cooperation Agreement on September 17, 2008 in respect of the aforementioned cooperative matters (the "Original Cooperation Agreement"). The Parties unanimously agree to amend and restate the Original Cooperation Agreement through friendly negotiation and the Original Cooperation Agreement is amended and restated as follows: 1. Business Cooperation Party A and Party B unanimously agree that the proposed cooperation shall be the internet-based sale and promotion of tour products conducted by Party A and its subsidiaries or other value-added business carried out by Party A. Party B shall provide the business consultancy and technical services as well as the technical consultancy as set forth in Article 3 hereinafter to Party A and its subsidiaries to facilitate them to conduct the aforementioned business and supply relevant products and services. 2. Exclusive Cooperation 2.1 Party A irrevocably undertakes that Party A will take Party B as its exclusive and sole partner to provide the business consultancy and technical services as well as technical consultancy to Party A and its subsidiaries. Party A shall not establish any same or similar cooperative relationship with any third party in respect of such businesses nor shall it make any same or similar arrangement, unless with the prior written consent of Party B. 2.2 Party A irrevocably undertakes that it will make best efforts to assist and endeavor to achieve the exclusive operation of thecooperative business to the extent permitted by laws. 2.3 Party A irrevocably undertakes that, without Party B's consent, Party A shall not conduct any other business or make any commercial arrangement, including without limitation being engaged in or otherwise participating in any commercial activities and businesses independently or together with any other person or entity, nor shall it carry out any activities that may be competitive with or cause adverse effect to Party B's business. 3. Party B's Services Party B undertakes to provide the following technical consultancy and services to Party A and its subsidiaries in respect of the cooperative business (collectively referred to as "Party B's Services"): 3.1 Research, development, production, test, operation and maintenance, upgrade and other services of relevant technology; 3.2 Development, construction, operation and maintenance, upgrade and other services of relevant internet platform and system; 3.3 Design the relevant tour products plan, and provide relevant training, implementation and upgrade and other services; 3.4 Consultancy services related to sale and promotion of tour products; 3.5 Other services as agreed by the Parties. Party A agrees that Party B may, at its own discretion, provide the aforementioned Party B's Services to Party A and its subsidiaries, or purchase the required services from any third party and provide the services to Party A and its subsidiaries. Party A shall cause its subsidiaries to
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Extract the exact clause related to "Liquidated Damages" from the excerpt above.