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An additional term is said to materially alter a contract 'if its incorporation into the contract without express awareness by the other party would result in surprise or hardship.' Maxon Corp. v. Tyler Pipe Industries, Inc., 497 N.E.2d 570, 576 (Ind.App. 1986); accord, Greenberg, Rights and Remedies Under U.C.C. Article 2, at 75 (1987); Annot., What Are Additional Terms Materially Altering Contract Within Meaning of UCC § 2-207(b), 72 A.L.R.3d 479, 483 (1976). A seller's attempt to limit the implied warranty of merchantability operates to materially alter the prior agreement as a matter of law. See Official Comment 4 to § 2-207;