a-ak aaaa aaab aaac aaas aaba aabb aabc aaca aacb aacc aack aacs aaka aasa aasc aass abaa abab abac abak abas abb- abba abbb abbs abca abcb abcc abcs abs- absa abss acaa acab acac acas acba acca accc accs acks acsa acsc acss akaa akas akca akka akqa aksa aqas aqsa asaa asab asac asak asas asba asc- asca ascb ascc ascq aska asks asqc assa assc assk assq asss baaa baak baas baba babb babs bac- baca bacc back bacs bak- baka baks baqa basa basc bask bass bbas bbbb bbbq bbbs bbqs bcaa bcas bcbc bcbs bcca bccc bccs bcsa bcsc bcss bsaa bsac bsas bscs bssc caaa caab caac caas caba cabs cac- caca cacc cack caka casa casb casc cask cass cbac cbbc cbbs cbca cbcc cbcs cbka cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs ccsa ccss ckac ckbc ckck ckcs cksa cksb csaa csab csac csak csas cscb cscc cscs cska csks cssa kaaa kaab kaak kaaq kaas kaba kabb kabc kabq kacb kacc kacq kacs kaka kakc kakk kaks kas- kasa kasb kasc kask kass kbaa kbab kbac kbak kbaq kbas kbba kbbb kbbc kbbk kbbs kbca kbcb kbck kbcq kbcs kbkb kbkk kbqb kbsa kbsb kbsk kbsq kbss kcaa kcab kcac kcaq kcas kcba kcbc kcbk kcbq kcbs kcca kccb kccc kcck kckc kckk kcqq kcsa kcsb kcsc kcss kkaa kkac kkaq kkba kkbb kkbq kkbs kkcb kkck kkcq kkcs kkkk kkqq kksa kkss kqac kqak kqaq kqba kqbb kqbk kqca kqck kqcs kqkk kqks kqqa kqqk kqqq kqqs kqsc kqsk kqss ksab ksac ksak ksaq ksas ksba ksbc ksbq ksbs ksca kscb ksck kscq kscs kska kskb kskk kskq ksks ksqa ksqb ksqq ksqs kssa kssq ksss qa-c qass qqqq qsas qsqs sa-c saab saac saak saas saba sabb sabc sabs saca sacc sack sacs saka sakb sakk saks sasa sasc sask sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scak scas scba sccc sccs sck- scsa scsc skab skac skss ssaa ssab ssac ssas ssca sscc sscs sssa sssb sssc ssss