\forall (b: B).(\forall (c1: C).(\forall (c2: C).(\forall (u2: T).((clear c1
(CHead c2 (Bind b) u2)) \to (\forall (k: K).(\forall (u1: T).(clear (CTail k
u1 c1) (CHead (CTail k u1 c2) (Bind b) u2))))))))
\forall (b: B).(\forall (c1: C).(\forall (c2: C).(\forall (u2: T).((clear c1
(CHead c2 (Bind b) u2)) \to (\forall (k: K).(\forall (u1: T).(clear (CTail k
u1 c1) (CHead (CTail k u1 c2) (Bind b) u2))))))))