proposition: Lemma parttuple_minnC sh1 sh2 : parttuple_minn sh1 sh2 = parttuple_minn sh2 sh1.
proof: Proof. by apply eq_from_tnth => i; rewrite !tnth_mktuple minnC. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype