bbbb bcbc bccc bctc bcuc bobb bobo bobu bock boco bocu boko boku boob booc book boot botb boto bott bouk bout btcc btob bttb bubb bubo bubu bucc buck buco bucu bukk buko buku but- buto butt c-bo cbbc cbcc cbct cbcu cbko cbot cbtc ccbc cccb cccc cccu ccob ccoc cctb cctc cctt ccuc ccut ckbc ckck ckco ckob ckoc ckoo ckot cktb cobb cobo cobu cock coco coct cocu cok- coko coob cook coot cotb cotc coto cott cotu coub couk cout ctot cub- cubb cucc cuck cuk- cut- cutc cuto cutt kbbb kbbc kbbk kbbo kbbt kbbu kbcb kbck kbco kbct kbcu kbkb kbkk kbko kbob kboc kbok kboo kbot kbtb kbtc kbtk kbto kbtt kbub kbuc kbuk kbut kbuu kcbc kcbk kcbu kccb kccc kcck kcct kccu kckc kckk kcko kcob kcot kcou kctb kctc kcto kctu kcub kcuk kkbb kkbo kkbt kkcb kkck kkco kkct kkkk kkob kkoo kkot kktc kktk kktu kkut kkuu kobb kobc kobk kobo kobu kocb kock koct kokb kokc kokk koko koku koob kooc kook kooo koot koou kotb kotc kotk koto kott kotu koub kout kouu ktbb ktbc ktbt ktbu ktcc ktck ktco ktkb ktkc ktkk ktko ktkt ktku ktob ktoc ktok ktoo ktot kttc kttk ktto kttt kttu ktub ktuc kubb kubc kubo kubu kucb kucc kuco kukk kuku kuok kuoo kuto kutt kutu kuub kuuk kuuu obbo obkb obok obot ocbc occc occt oct- octo okcu okko okok okot okto ooku oooo ootb oto- otok otoo otto ottu oucc out- outb outo ouu- tbcb tbcc tccc tccu tctc tobo tobt tobu tock toco toko toku took toot totc toto tott touk tout ttbb tttt tubb tubo tubu tucc tuck tuco tuko tuto tutt tutu tuuo ubbo uboc ucbc ucut ukcc ukko ukok uocc utto uttu uuoc uuuu