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Whether Seller had reasonable grounds for insecurity is a question of fact. See AMF, Inc. v. McDonald's Corp., 536 F.2d 1167 (7th Cir. 1976). Generally, the express language of the statute is followed such that a demand for assurances of performance must be in writing in order to be effective. National Ropes, Inc. v. National Diving Service, Inc., 513 F.2d 53 (5th Cir. 1975); Teeman v. Jurek, 312 Minn. 292, 251 N.W. 2d 698 (1977); Bodine Sewer v. Eastern Illinois Precast, 143 Ill. App. 3d 920, 493 N.E. 2d 705, 97 Ill. Dec. 898 (Ill App. 4 Dist); Automated Energy Systems, ...