a-ak a-ok aaaa aaac aaae aaca aacc aace aack aaco aaea aaec aaka aake aaoe aaoo acaa acac acae acca accc acce acco ace- acea acec acek acke acoa acoe aeac aeka akaa akae akao akca akee akka akko akok aoca aoce caaa caac cac- caca cacc cace cack caco caec caka cake ccaa ccac ccca cccc ccee ccoc ceac cec- ceca cece ceco ceec ceke ckac ckck ckco ckoa ckoc ckoo coak coca coce cock coco cok- coka coke coko cook eaca eacc eaec ecaa ecac ecao ecca eccc ecce ecco ecka ecko eco- eeca eeea eeee eeka eeke eeoc eka- ekco ekek ekka ekoa eoka kaaa kaak kacc kace kaco kaeo kaka kakc kake kakk kako kaoa kaoc kaok kcaa kcac kcca kccc kcck kcea kcec kcee kceo kckc kckk kcko kcoe kea- keak keca keck keco keek keka kekc keke keko keok kkaa kkac kkck kkco kkea kkkk kkoa kkoo koac koae koak koca kock koea koka kokc koke kokk koko kooc kook kooo o-eo oake ocac ocak occa occc oce ocee ocke oec- oeca oecc oeec okak okka okko okok ooaa ooak oooo