a-ak a-ha a-ok aaaa aaab aaac aaah aaba aabb aabc aabh aaca aacb aacc aach aack aaco aaha aahk aaka aaoo abaa abab abac abak abb- abba abbb abbo abca abcb abcc abch abha abho aboa abob aboh abok aboo acaa acab acac acba acca accc acch acco acha achh acho acoa acoh ahab ahac ahah ahha ahoa ahok akaa akah akao akca akha akka akko akok aoah aoba aoca baaa baah baak baba babb babo bac- baca bacc bach back baco baha baho bak- baka bakh bako baoh bbbb bbch bcaa bcbc bcca bccc bhao bhca bhcc boab boac boak boba bobb bobo boca boch bock boco boha boho boka boko boob booc booh book c-bo caaa caab caac caah caba cabo cac- caca cacc cach cack caco caha caka cbac cbbc cbca cbcc cbha cbka cbko ccaa ccab ccac ccba ccbc ccca cccb cccc ccha ccob ccoc chaa chab chac chah chak chao chca chch chha chka chkb choc choh chok choo ckac ckbc ckch ckck ckco ckoa ckob ckoc ckoo coak coba cobb cobh cobo coca coch cock coco coha coho cok- coka coko coob cooh cook haab haak haba habo hack haco haha haho haka hakk hako hboc hcbc hcca hccb hccc hcch hhaa hhhh hkcc hoac hoba hobo hoca hoch hock hoha hoho hoka hoko hook kaaa kaab kaak kaba kabb kabc kabo kacb kacc kach kaco kaha kahc kaho kaka kakc kakh kakk kako kaoa kaoc kaok kbaa kbab kbac kbak kbba kbbb kbbc kbbk kbbo kbca kbcb kbch kbck kbco kbhb kbhc kbhh kbkb kbkk kbko kboa kbob kboc kbok kboo kcaa kcab kcac kcah kcba kcbc kcbk kcca kccb kccc kcck kcha kchh kchk kcho kckc kckk kcko kcob kcoh khab khac khak khao khbc khca khcb khcc khch khck khhk khho khka khkk khoa khob khoc khok kkaa kkac kkba kkbb kkbo kkcb kkch kkck kkco kkha kkhb kkhh kkhk kkkk kkoa kkob kkoh kkoo koab koac koak koba kobb kobc kobk kobo koca kocb koch kock koha kohh koho koka kokb kokc kokh kokk koko koob kooc kook kooo obak obba obbo obkb obok ocab ocac ocak ocbc occa occc ocha ohba ohcc ohho ohob ohoh ohok okak okha okka okko okok ooaa ooak ooba ooha ooho oooh oooo