a-ak a-ii a-ok aaaa aaab aaac aaai aaba aabb aabc aabi aaca aacb aacc aaci aack aaco aaib aaic aaii aaka aaoo abaa abab abac abai abak abb- abba abbb abbi abbo abca abcb abcc abci abia abib abic aboa abob abok aboo acaa acab acac acai acba acca accc acci acco aci- acia acic acoa aiai aiba aibo aica aicc aiia aiib aiic aika aiki aiko aioc aioi akaa akai akao akca akia akik akio akka akki akko akok aoba aoca aoki ba-i baaa baak baba babb babi babo bac- baca bacc baci back baco baia baib baic baik baio bak- baka baki bako bbbb bbci bcaa bcbc bcca bccc bcci bcia biak biao biba bibb bibi bibo bica bicc bici bick bico biko bio- bioc bioi boab boac boai boak boba bobb bobi bobo boca bock boco boi- boii boka boki boko boob booc book c-bo caaa caab caac caba cabi cabo cac- caca cacc caci cack caco caia caib caic caik caio caka caoi cbac cbbc cbca cbcc cbia cbka cbko ccaa ccab ccac ccai ccba ccbc ccca cccb cccc ccci ccic ccii ccob ccoc ciaa ciak ciao ciba cibc cibi cibo cica cicc cici cico ciia ciii cika ciko ciob ckac ckbc ckbi ckck ckco ckoa ckob ckoc ckoi ckoo coai coak coba cobb cobi cobo coca cock coco coia cok- coka coko coob cook iaaa iaac iaai iaba iaca iacc iaia ibac ibca ibia icaa icab icac icai icao icbc icca iccb iccc icci icco icoc iiac iica iiii iiio iioi iioo ikki ikko ikoo ioba iobi ioci ioii ioio ioko iooi iooo k-ci kaaa kaab kaai kaak kaba kabb kabc kabi kabo kacb kacc kaci kaco kaia kaib kaic kaii kaik kaio kaka kakc kaki kakk kako kaoa kaoc kaoi kaok kbaa kbab kbac kbai kbak kbba kbbb kbbc kbbi kbbk kbbo kbca kbcb kbci kbck kbco kbia kbib kbic kbik kbio kbkb kbkk kbko kboa kbob kboc kboi kbok kboo kcaa kcab kcac kcai kcba kcbc kcbi kcbk kcca kccb kccc kcci kcck kcic kcii kckc kckk kcko kcob kiab kiac kiai kiba kibb kibc kibi kibo kica kicb kicc kick kiia kiic kiii kiik kika kikc kiki kikk kiko kioa kioc kioi kiok kioo kkaa kkac kkai kkba kkbb kkbi kkbo kkcb kkci kkck kkco kkia kkic kkik kkkk kkoa kkob kkoo koab koac koai koak koba kobb kobc kobi kobk kobo koca kocb koci kock koii koka kokb kokc koki kokk koko koob kooc kooi kook kooo oaic obai obak obba obbo obia obkb oboi obok ocab ocac ocak ocbc occa occc occi oiba oici oick oiii oiko okak okia okic okka okko okok ooaa ooak ooba oobi ooia oooo