proposition: Lemma InPtUnEL k v f f' : valid f -> f = pts k v \+ f' -> (k, v) \In f.
proof: Proof. by move/[swap] ->; apply: InPtUnL. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)