unfold A_NMAC, A_NMAC_G1_0.
inline_first.
comp_skip.
remember (splitVector c c x) as z.
comp_simp.
erewrite append_splitVector.
reflexivity.
trivial.
Qed.

(* Specifications: *)
Theorem A_NMAC_G1_0_1_equiv :
Pr[A_NMAC_G1_0] == Pr[A_NMAC_G1_1].