rewrite A_NMAC_G1_0_equiv.
rewrite A_NMAC_G1_0_1_equiv.
apply A_NMAC_G1_1_equiv.
Qed.

Theorem xor_1_1 :
forall (n : nat)(x y z : Bvector n),
BVxor _ y x = BVxor _ z x ->
y = z.