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'A waiver of a breach of contract must be a 'voluntary, intentional relinquishment of a known right.' ' Bissell v. L.W. Edison Co., 9 Mich.App. 276, 156 N.W.2d 623, 627 (1967) (quoting Don-Ray Tool & Die, Inc. v. John Hancock Mutual Life Insurance Co., 5 Mich.App. 263, 146 N.W.2d 139, 142 (1966)). '[A] waiver may be shown by proof of express language of agreement or inferably established by such declarations, acts, and conduct of the party against whom it is claimed as are inconsistent with a purpose to exact strict performance.' Strom-Johnson Construction Co. v. Riverview Furniture Store, 227 Mich. 55, 198 ...