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The relevant portions of § 2-719 are these: '(1) Subject to the provisions of subsections (2) and (3) . . . (a) the agreement . . . may limit . . . the measure of damages recoverable . . . as by limiting the buyer's remedies to . . . replacement of non-conforming goods . . .; and (b) resort to a remedy as provided is optional unless the remedy is expressly agreed to be exclusive, in which case it is the sole remedy. (2) Where circumstances cause an exclusive or limited remedy to fail of its essential purpose, remedy may be had as ...