establish that a nation occurred, or to show that. at some time subse- quent to the November 1984 contract, Epstein agreed to personally guarantee 1 A.G.'s debt. A nation is not enforceable absent consider- ation. Kasper I. Roberts. 119 Misc.2d 829, 464 N.Y.S.2d 642. 644 (N.T.Cit-.O.1983). Moreover, a