proposition: Lemma reduced_iiF i : [:: i; i] \is reduced = false.
proof: Proof. Proof using. by rewrite unfold_in /= big_cons big_seq1 eltr2 length1. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(fingroup perm morphism presentation) mathcomp(ssralg poly ssrint) permcomp tools permuted combclass congr