aaaa aaab aaac aaal aaas aaba aabb aabc aabl aaca aacb aacc aacl aacs aala aalc aall aals aasa aasc aass abaa abab abac abal abas abb- abba abbb abbs abca abcb abcc abcl abcs abla abls abs- absa absl abss acaa acab acac acas acba acbl acca accc accs acla aclc acls acsa acsc acsl acss alaa alac alal alas alb- alba albc albs alca alcc alcs all- alla alll alls alsa alsc asaa asab asac asal asas asba asc- asca ascb ascc ascl asla assa assc assl asss baaa baal baas baba babb babs bac- baca bacc bacs bala balc ball bals basa basc bass bbas bbbb bbbs bblb bbls bcaa bcas bcbc bcbs bcca bccc bccl bccs bcsa bcsc bcsl bcss blaa blab blac blas blls blss bsaa bsac bsas bscs bslc bssc caaa caab caac caal caas caba cabs cac- caca cacc cala calc call cals casa casb casc casl cass cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cblb cblc cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccsa ccsl ccss clab clas clsa clsc csaa csab csac csas cscb cscc cscl cscs csla cssa laaa laac laal laas laba labs laca lacc lacl lacs lala lall lasa lass lbcc lbsc lcac lcbc lcca lccc lccs lcls lcsc llbs llcc llcs lllc llll lscb lscs lsla lssa sa-c saab saac saal saas saba sabb sabc sabs saca sacc sacs sala salc sall sals sasa sasc sasl sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scal scas scba sccc sccl sccs scl- sclc scls scsa scsc scsl slaa slab slac slas slcc slsa slsc ssaa ssab ssac ssas ssca sscc sscs ssla sslc sssa sssb sssc ssss