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open for a period of time) are valid without consideration if signed by the offeror, and are irrevocable for the time stated on the purchase order (but no longer than three months), or, if no time is stated, for a reasonable time.
* An offer to buy goods for "prompt shipment" invites acceptance by either prompt shipment or a prompt promise to ship. Therefore, this offer is not strictly unilateral. However, this "acceptance by performance" does not even have to be by conforming goods (for example, incomplete sets).
* Consideration--modifications

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