ithdrawn applies only to statements leading up to agreement and not those made after agreement. Fed.Rules Cr.Proc.Rule I I (c)(6), 18 U.S.C.A. *31 James P. Turner, Acting Asst. Atty. Gen., Civ. Rights Div., U.S. Dept. of Justice, Barry Kowalski & Suzanne Drouet, Attys., Crim. Section, Washing- ton, D.C., for