proposition: Lemma axRot s xs : mprv (\and_(<- s :: xs) ---> \and_(<- rcons xs s)).
proof: Proof. apply: and_sub => x. by rewrite mem_rcons. Qed.
imports: mathcomp(all_ssreflect) CompDecModal.libs(edone base fset induced_sym) Setoid Morphisms Relation_Definitions