Section STOREBYTES.
Variable m1: mem.
Variable b: block.
Variable ofs: Z.
Variable bytes: list memval.
Variable m2: mem.
Hypothesis STORE: storebytes m1 b ofs bytes = Some m2.

Theorem perm_storebytes_1:
forall b' ofs' k p, perm m1 b' ofs' k p -> perm m2 b' ofs' k p.