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 10.18 MASTER SUPPLY AGREEMENT MASTER SUPPLY AGREEMENT (the "Agreement") dated November 1, 2019 (the "Effective Date") between REYNOLDS CONSUMER PRODUCTS LLC, a Delaware limited liability company with its headquarters at 1900 West Field Court, Lake Forest, IL 60045 ("Seller"), and PACTIV LLC, a Delaware limited liability company with its headquarters at 1900 West Field Court, Lake Forest, IL 60045 ("Buyer"). Seller and Buyer are referred to individually at times as a "Party" and collectively at times as the "Parties". BACKGROUND A. Seller sells various types of products used in the consumer and food service markets. B. Buyer sells various types of products, including certain products of the type made by Seller, to its customers. C. The Parties are entering into this Agreement to establish the terms and conditions under which Seller may agree to sell specific products to Buyer, and Buyer may agree to purchase specific products from Seller for later resale by Buyer to its business customers. AGREEMENT 1. Term. The "Term" of this Agreement will commence on the Effective Date and will end on the earlier of: (a) the first anniversary of the expiration date of the last Purchase Schedule (as defined in this next Section); (b) a termination date elected by a Party in a written notice delivered to the other Party any time after the expiration of the last Purchase Schedule; or (c) a termination date elected by a Party in a written notice delivered to the other Party as provided in Subsection 11(d) of this Agreement. The rights and obligations of the Parties under this Agreement will survive the expiration or earlier termination of this Agreement with respect to any (i) products purchased and sold under this Agreement during the Term and products sold after the Term for orders accepted during the Term; (ii) Confidential Information (as defined in Section 10 of this Agreement) disclosed or received by a Party during the Term; (iii) breach of this Agreement by a Party; (iv) any other statement, decision, act or omission of a Party concerning or related to this Agreement; (v) any Dispute (as defined in Section 11 of this Agreement) between the Parties concerning or related to this Agreement; (vi) products and other materials manufactured or maintained by Seller in inventory for sale to Buyer that Buyer is obligated to purchase under a Purchase Schedule; and (vii) any provision that expressly states that it will survive the expiration or earlier termination of this Agreement. 2. Scope. This Agreement will apply to all products sold by Seller to Buyer, and all products purchased by Buyer from Seller, during the Term unless the Parties expressly agree that this Agreement will not apply to a particular type of transaction in a separate written document signed by an officer of each Party. This Agreement will not require Seller to sell any type or quantity of a product to Buyer, nor will this Agreement required Buyer to purchase any type or quantity of a product from Seller, except as expressly provided by the Parties in a Purchase Schedule. The phrase "Purchase Schedule" will mean a written supplement to this Agreement signed by an officer of each Party which references this Agreement and which identities, among other terms and conditions, the specific types and quantities of products that will be purchased and sold by the Parties on terms and conditions in the schedule, the specifications for the identified products, the duration of the commitment period during which the Parties will be obligated to purchase and sell the identified products on the terms and conditions in the schedule, the prices of the identified products, any mechanisms for adjusting the prices of the identified products over the commitment period, and the facilities at which the identified products will be manufactured, stored and delivered by Seller. The Parties may add terms and conditions to, and amend the terms and conditions of, this Agreement in a Purchase Schedule, but any additional and amended terms and conditions in a Purchase Schedule supplementing and modifying this Agreement will only apply the specific products identified in that Purchase Schedule for its duration. Source: REYNOLDS CONSUMER PRODUCTS INC., S-1, 11/15/2019 3. Standard Operating Procedures. Over approximately the past eight years, the Parties have been supplying select Products to one another for use in the operation of their respective businesses within the United States of America, Canada and Mexico. The Parties developed and been following certain standard operating procedures in connecting with, among other topics, forecasting, production planning, ordering, delivering
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Extract the exact clause related to "Parties" from the excerpt above.

assistant: Seller and Buyer are referred to individually at times as a "Party" and collectively at times as the "Parties".