Module Rmaps_Lemmas (R0: RMAPS).
Module R := R0.
Hint Resolve (@subp_sepcon _ Join_rmap Perm_rmap Sep_rmap): contractive.

Lemma necR_NOx:
forall phi phi' l sh nsh,
necR phi phi' ->
phi@l = NO sh nsh ->
phi'@l = NO sh nsh.