proposition: Fact total : total (<=%O : rel (seq T)).
proof: Proof. by elim=> [|x1 s1 ihs1] [|x2 s2]//=; rewrite !lexi_cons; case: ltgtP => /=. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)