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  Section 2-207 addresses the situation when parties consummate a sale of goods notwithstanding their exchange of non-identical term sheets. See U.C.C. § 2-207 cmt. 1; Olefins Trading, Inc. v. Han Yang Chem Corp., 9 F.3d 282, 287-88 (3d Cir. 1993). To simplify business transactions, the drafters of the U.C.C. recognized that 'a proposed deal which in commercial understanding has in fact been closed is recognized as a contract.' U.C.C. § 2-207 cmt. 2. Proof of a contract can be established by either '[a] definite and seasonable expression of acceptance or a written confirmation which is sent within a reasonable time' after ...