proposition: Lemma reprfg0 : repr zero = Prefreeg [::] :> prefreeg R K.
proof: Proof. by apply/eqP; rewrite !piE eqE; apply/eqP/perm_small_eq/perm_eq_fgrepr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)