a-ak a-ok aaaa aaab aaac aaba aabb aabc aaca aacb aacc aack aaco aacu aaka aaku aaoo abaa abab abac abak abau abb- abba abbb abbo abca abcb abcc aboa abob abok aboo abou abua abuk acaa acab acac acba acca accc acco accu acoa acou acu- acuo akaa akao akca akka akko akku akok akua aoba aoca auaa auca baaa baak baba babb babo babu bac- baca bacc back baco bak- baka bako baku bau- bauk bbau bbbb bcaa bcbc bcca bccc bcuc boab boac boak boba bobb bobo bobu boca bock boco bocu boka boko boku boob booc book boua bouk buba bubb bubo bubu buca bucc buck buco bucu buka bukk buko buku c-bo caaa caab caac caba cabo cabu cac- caca cacc cack caco caka cauc cauk cauo cbac cbbc cbca cbcc cbcu cbka cbko ccaa ccab ccac ccba ccbc ccca cccb cccc cccu ccob ccoc ccuc ckac ckbc ckck ckco ckoa ckob ckoc ckoo coak coba cobb cobo cobu coca cock coco cocu cok- coka coko coob cook coua coub couk cuau cub- cuba cubb cuca cucc cuck cuk- cuka kaaa kaab kaak kaba kabb kabc kabo kabu kacb kacc kaco kacu kaka kakc kakk kako kaku kaoa kaoc kaok kau- kaub kauc kauk kauo kbaa kbab kbac kbak kbba kbbb kbbc kbbk kbbo kbbu kbca kbcb kbck kbco kbcu kbkb kbkk kbko kboa kbob kboc kbok kboo kbua kbub kbuc kbuk kbuu kcaa kcab kcac kcau kcba kcbc kcbk kcbu kcca kccb kccc kcck kccu kckc kckk kcko kcob kcou kcua kcub kcuk kkaa kkac kkba kkbb kkbo kkcb kkck kkco kkkk kkoa kkob kkoo kkua kkuu koab koac koak koba kobb kobc kobk kobo kobu koca kocb kock koka kokb kokc kokk koko koku koob kooc kook kooo koou koua koub kouu kuac kuau kuba kubb kubc kubo kubu kuca kucb kucc kuco kuka kukk kuku kuoa kuok kuoo kuub kuuk kuuu oaau obak obba obbo obkb obok ocab ocac ocak ocbc occa occc okak okcu okka okko okok ooaa ooak ooba ooku oooo ouac oucc ouu- uabc uaca uaoc uaua ubac ubba ubbo uboc ucak ucbc ucca ucka ucua ukba ukcc ukko ukok uocc uuoc uuuu