proposition: Lemma uniq_rangePtUn k v f : valid (pts k v \+ f) -> uniq (range (pts k v \+ f)) = uniq (v :: range f).
proof: Proof. by move=>W; rewrite uniq_rangeUn // rangePtK // (validPtUn_cond W). Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)