a-ak aaaa aaab aaac aaba aabb aabc aabt aaca aacb aacc aack aact aacu aaka aaku aata aatc aatk aatt abaa abab abac abak abat abau abb- abba abbb abbt abca abcb abcc abct abta abtu abua abuk abut ac-t acaa acab acac acat acba acca accc acct accu acta actc actt actu acu- acut akaa akca akka akku akua at-t ataa atab atac atak atat atca atcc atck atka atkt atta attu atua atub atuc atuk auaa auca auct aut- baaa baak baat baba babb babu bac- baca bacc back bact bak- baka bakt baku bata batc batt batu bau- bauk bbau bbbb bcaa bcat bcbc bcca bccc bctc bcuc btaa btcc bttb buat buba bubb bubu buca bucc buck bucu buka bukk buku but- buta butt caaa caab caac caat caba cabu cac- caca cacc cack caka cat- cata catb catc catt catu cauc cauk caut cbac cbat cbbc cbca cbcc cbct cbcu cbka cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccu cctb cctc cctt ccuc ccut ckac ckat ckbc ckck cktb ctab ctba ctca ctta cuau cub- cuba cubb cuca cucc cuck cuk- cuka cut- cuta cutc cutt kaaa kaab kaak kaat kaba kabb kabc kabu kacb kacc kact kacu kaka kakc kakk kakt kaku kat- kata katb katc katk katt katu kau- kaub kauc kauk kbaa kbab kbac kbak kbat kbba kbbb kbbc kbbk kbbt kbbu kbca kbcb kbck kbct kbcu kbkb kbkk kbta kbtb kbtc kbtk kbtt kbua kbub kbuc kbuk kbut kbuu kcaa kcab kcac kcat kcau kcba kcbc kcbk kcbu kcca kccb kccc kcck kcct kccu kckc kckk kcta kctb kctc kctu kcua kcub kcuk kkaa kkac kkat kkba kkbb kkbt kkcb kkck kkct kkkk kktc kktk kktu kkua kkut kkuu ktaa ktak ktat ktba ktbb ktbc ktbt ktbu ktcc ktck ktkb ktkc ktkk ktkt ktku kttc kttk kttt kttu ktub ktuc kuac kuat kuau kuba kubb kubc kubu kuca kucb kucc kuka kukk kuku kuta kutt kutu kuub kuuk kuuu taa- taat taba tabb tabc tabu taca tacc tack tact taka takk takt taku tata tatb tatt tatu taua taub tauc tauk taut tbca tbcb tbcc tbta tcca tccc tccu tctc tkac ttab ttbb tttt tuak tuat tuba tubb tubu tuca tucc tuck tuka tuta tutt tutu uabc uaca uata uatu uaua ubac ubba ucak ucat ucbc ucca ucka ucua ucut ukba ukcc ukta utac utau uttu uuta uuuu