proposition: Lemma pcm33_morph_ax : morph_axiom (@sepT (prod3_PCM U1 U2 U3)) pcm33.
proof: Proof. by split=>[|x y]; rewrite !pcmE /= !pcmE // =>/and3P []. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(eqtype fintype) pcm(options axioms prelude) pcm(pcm)