(c2: C).(drop1 p c2 e)) (nf2 c (lift n n0 (lift1 p t))) (\lambda (x:
C).(\lambda (H3: (drop n n0 c x)).(\lambda (H4: (drop1 p x e)).(nf2_lift x
(lift1 p t) (H x t H4 H1) c n n0 H3)))) H2))))))))))) hds)).
(c2: C).(drop1 p c2 e)) (nf2 c (lift n n0 (lift1 p t))) (\lambda (x:
C).(\lambda (H3: (drop n n0 c x)).(\lambda (H4: (drop1 p x e)).(nf2_lift x
(lift1 p t) (H x t H4 H1) c n n0 H3)))) H2))))))))))) hds)).