fact: Definition ColFnext (l : letter) (c : 'cV[letter]_m) (s : {set 'I_m}) := l :: [seq c m0 ord0 | m0 in s].
imports: mathcomp(all_ssreflect ssralg fingroup finalg perm zmodp) mathcomp(matrix) ssr_ext ssralg_ext num_occ f2 ssrR hamming tanner linearcode