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 Extrinsic evidence may be used to interpret an integrated contract. Application of the parol evidence rule determines only which terms are contained in the parties' final agreement. 810 ILCS 5/2--207 (West 2000). It does not preclude the admission of extrinsic evidence to interpret those terms. See McMahon Food Corp. v. Burger Dairy Co., 103 F.3d 1307, 1314 (7th Cir. 1996) (recognizing that, in cases in which the UCC governs, Illinois law does not require a finding of ambiguity as a condition for the admission of extrinsic evidence to 'determine whether an agreement is completely or partially integrated, and to explain the meaning ...