proposition: Lemma sop_spec x (n0 : 'I_6): nth F0 (sop x) n0 = x n0.
proof: Proof. by rewrite nth_fgraph_ord pvalE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop finset fingroup) mathcomp(action perm primitive_action)