proposition: Lemma dest_dist1 s : s \in conodes c -> dest_dist s = 1.
proof: Proof. move=> sc; by rewrite /dest_dist sc. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix perm) ssr_ext ssralg_ext fdist subgraph_partition tanner