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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between ExxonMobil Chemical Company and/or ExxonMobil Chemical Services Americas, Inc. and Buyer Affiliates in the U.S., Mexico and Brazil shall be subject to the terms and conditions set forth in Attachment A hereto. Any and all sales of Product between ExxonMobil Petroleum & Chemical and Buyer Affiliates in France, Germany, Denmark, Serbia, Ireland and the United Kingdom shall be subject to the terms and conditions set forth in Attachment H hereto. Any and all sales of Product between ExxonMobil Chemical Asia Pacific and Buyer Affiliates in Singapore, China and India shall be subject to the terms and conditions set forth in Attachment G hereto. Buyer/Buyer Affiliates are responsible for the Product and returnable crates in their custody at the sales value of the Product and the replacement value of the metal crates, respectively. The terms relating to the use and return of metal crates are set out in Attachment F. AFFILIATES ExxonMobil Selling Affiliates participating in this Agreement are listed in Attachment B. Buyer Affiliates participating in this Agreement are listed in Attachment C. Seller and Buyer each represent and warrant that each will cause its respective affiliates, so listed, to become bound to the terms of this Agreement. QUALITY Product shall conform to ExxonMobil Selling Affiliates' standard sales specifications as of the date of shipment. Sellers agrees to support the creation of purchasing specifications for Products by Buyer and agrees to supply Products in accordance to those purchasing specifications. Seller has the right to review each purchasing specification and needs to accept in writing before such purchasing specifications become effective. Seller has the right to take exceptions to terms and provisions in these purchasing specifications if in contradiction with Seller's Sales specifications, General Terms and Condition of Sales or other Seller's procedures and policies. Source: WEST PHARMACEUTICAL SERVICES INC, 8-K, 1/16/2020 Buyer and Seller agree to enter into negotiations on an extended Quality Assurance Agreement. Provided that these negotiations will be successful, such agreement shall then be incorporated into this Contract as an amendment to it. AGREEMENT PERIOD Effective Date: January 1, 2019 Termination Date: December 31, 2023 PAYMENT TERMS Buyer/Buyer Affiliates shall pay for Product by Electronic Funds Transfer (EFT) through the Automated Clearing House (ACH) using the Corporate Trade Exchange (CTX) format, according to the payment terms described in Attachment E. TECHNICAL SUPPORT EMCC/A will provide technical expertise in the use of Products and will use its technical centers to enhance technical communications with West Pharmaceutical Services Affiliates technical centers. West/A will share its needs with EMCC/A and how they relate to West/A activities to help guide ExxonMobil Chemical Affiliates technical efforts. The parties have created and continue to entertain a research and development governance structure with a steering team, program management team and working team. The charter, roles and meeting frequencies are described in mutually agreed documents and will be reviewed periodically as deemed appropriate by the parties. SAFETY, HEALTH & ENVIRONMENT Safety, health and environment (SHE) professional representatives from both parties shall endeavor to meet once a year (face to face or via teleconference) to exchange and benchmark on best practices. The parties agree to notify each other on SHE related issues that may arise from the use of Products. The parties agree to explore the reuse/recycling of articles, manufacturing trim and scrap Buyer produces from Products purchased from Seller. AUDIT On request of Buyer, Buyer is allowed to carry out on-site manufacturing and quality audits in manufacturing units where Products are produced. The frequency of such audits shall not exceed one audit per site within three years SUPPLY SECURITY Buyer is seeking for an increased level of supply security and additional risk mitigation strategies and actions in case of short and long term supply disruptions of Products. Seller agrees to enter into discussions and negotiations with Buyer and to take reasonable efforts to enhance such risk mitigation and business continuity strategies. COLLABORATION PLANNING AND SUPPLY ASSURANCE, FORECAST Buyer and Seller agree to convene once every calendar year to discuss annual Product quantities. Buyer has provided Seller with an annual non- binding forecast for the respective contract year. As requested by the Seller, the Buyer will provide a quarterly forecast for the subsequent contract years. Seller will provide Buyer a quarterly overview of the planned production run of each Butyl grade purchased for Buyer. Seller shall acknowledge in writing the requested delivery and timing of Products and Volumes. Source: WEST PHARMACEUTICAL SERVICES INC, 8-K, 1/16/2020 CHANGE CONTROL Changes to the manufacturing process are carefully controlled
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Extract the exact clause related to "Minimum Commitment" from the excerpt above.