Instance andp_imp_CCC: forall A {ND : NatDed A}, CCCviaNatDed A andp imp.
Instance sepcon_wand_CCC: forall A {ND : NatDed A} {SL: SepLog A}, CCCviaNatDed A sepcon wand.

Lemma ND_prop_ext {A}{ND: NatDed A}: forall P Q, (P <-> Q) -> !! P = !! Q.