(* KEEP TOGETHER> *)
unfold q. rewrite uhwm_eq. rewrite h'_eq. fold M'. rewrite M'_M. trivial. Qed.

Lemma le_M_2pp : M <= 2 ^ p.
rewrite p_M. generalize le_1_M. case M. intro. absurd (2 <= 0); omega. intros q0 H.