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 A 'no waiver' clause is appropriate in a complex multiyear contract that imposes duties of performance on both parties, as distinct from a simple sales contract in which one party performs and the other pays. If a party lost a contract right through waiver by failing to assert it as soon as it was violated, the process of amicable adjustment of contingencies bound to arise in the course of performing the contract would be impeded by premature assertion of legal claims. Monarch Coaches, Inc. v. ITT Industrial Credit, 818 F.2d 11, 13 (7th Cir. 1987); S & R Co. of Kingston v. ...