a-ak aaaa aaab aaac aaal aaas aaba aabb aabc aabl aaca aacb aacc aack aacl aacs aaka aala aalc aall aals aasa aasc aass abaa abab abac abaj abak abal abas abb- abba abbb abbs abca abcb abcc abcl abcs abjs abla ablj abls abs- absa absl abss acaa acab acac acas acba acbl acca accc accs acks acla aclc acls acsa acsc acsl acss ajab ajac ajak ajas ajba ajka ajla ajss akaa akal akas akca akka aksa alaa alac alak alal alas alb- alba albc albs alca alcc alcs aljs alk- alka alkb all- alla alll alls alsa alsc asaa asab asac asak asal asas asba asc- asca ascb ascc ascj ascl asja aska asks asla assa assc assk assl asss baaa baak baal baas baba babb babs bac- baca bacc back bacs baja bajs bak- baka bakl baks bala balc balk ball bals basa basc bask bass bbas bbbb bbbs bblb bbls bcaa bcas bcbc bcbs bcca bccc bccl bccs bcsa bcsc bcsl bcss bjcc blaa blab blac blaj blak blas blkb blls blss bsaa bsac bsas bscs bslc bssc caaa caab caac caal caas caba cabs cac- caca cacc cack caja caka cala calc calk call cals casa casb casc cask casl cass cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cbka cbkj cbkl cblb cblc cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccl cccs ccla cclc ccls ccsa ccsl ccss cjbc cjbk cjca cjcb cjcj cjcl cjcs cjls cjsb cjsl cjss ckac ckbc ckck ckcl ckcs ckjs cksa cksb cksl clab clas clsa clsc csaa csab csac csak csas cscb cscc cscl cscs cska csks csla cssa jaak jaal jaas jaba jabs jaca jacc jack jacl jacs jaja jaka jala jalc jasa jasc jask jass jbaa jcbc jccc jcss jjcc jkcs jlab jsla jsss kaaa kaab kaak kaal kaas kaba kabb kabc kacb kacc kacl kacs kaja kajb kajc kajk kaka kakc kakj kakk kaks kala kalb kalc kalk kall kals kas- kasa kasb kasc kask kasl kass kbaa kbab kbac kbak kbal kbas kbba kbbb kbbc kbbk kbbl kbbs kbca kbcb kbck kbcl kbcs kbja kbjc kbjk kbjs kbkb kbkk kbkl kbla kblb kblj kbll kbls kbsa kbsb kbsj kbsk kbss kcaa kcab kcac kcal kcas kcba kcbc kcbk kcbl kcbs kcca kccb kccc kcck kccl kcjb kcjc kcjj kcjk kckc kckj kckk kckl kcla kclc kclk kcll kcls kcsa kcsb kcsc kcsj kcss kjaa kjac kjak kjal kjas kjbb kjbl kjcb kjcc kjck kjcs kjjj kjjk kjjl kjjs kjkj kjkk kjks kjla kjll kjls kjsa kjsk kjsl kkaa kkac kkal kkba kkbb kkbj kkbl kkbs kkcb kkcj kkck kkcl kkcs kkjb kkjk kkjl kkkj kkkk kklb kklc kkll kkls kksa kksj kkss klaa klab klac klaj klak klal klas klbb klbc klbj klbl klbs klca klcb klcc klck klcl klcs klja kljb klka klkc klkk klkl klks klla kllb kllc kllk klls klsa klsc ksab ksac ksak ksal ksas ksba ksbc ksbj ksbl ksbs ksca kscb kscj ksck kscl kscs ksjb ksjc ksjj ksjk ksjl ksjs kska kskb kskk ksks ksla kslb kslc kslk ksll kssa kssl ksss laaa laac laaj laak laal laas laba labs laca lacc lack lacl lacs laja lajs laka laks lala lall lasa lask lass lbcc lbsc lcac lcbc lcca lccc lccs lcls lcsc ljla lkab lkal llbs llcc llcs llks lllc llll lscb lscs lsla lssa sa-c saab saac saaj saak saal saas saba sabb sabc sabs saca sacc sack sacs saja saka sakb sakk saks sala salc salk sall sals sasa sasc sask sasl sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scak scal scas scba sccc sccl sccs sck- sckl scl- sclc sclk scls scsa scsc scsl sjab sjac sjcc sjcs skab skac skal skss slaa slab slac slak slas slcc slsa slsc ssaa ssab ssac ssas ssca sscc sscs ssla sslc sssa sssb sssc ssss