a-ak a-ok aaaa aaac aaae aaaf aaca aacc aace aacf aack aaco aaea aaec aafa aafc aaff aaka aake aaoe aaoo acaa acac acae acca accc acce accf acco ace- acea acec acek acfc acfe acke acoa acoe aeac aeaf aeka afaa afak afao afca afcc afee afek affa affc affo afka afoa afoe afoo akaa akae akao akca akee akka akko akok aoca aoce caaa caac caaf cac- caca cacc cace cack caco caec cafa cafc cafe caff caka cake ccaa ccac ccaf ccca cccc cccf ccee ccfa ccfc ccff ccoc ceac cec- ceca cece ceco ceec cef- cefa cefc ceke cfaa cfac cfae cfao cfca cfcf cfco cfoa ckac ckck ckco ckoa ckoc ckoo coak coca coce cock coco cofc cofe coff cok- coka coke coko coof cook eaaf eaca eacc eaec ecaa ecac ecao ecca eccc ecce ecco ecef ecfa ecfc ecka ecko eco- eeca eeea eeee eefa eefe eeka eeke eeoc efca efco efeo effa efke eka- ekco ekek ekfc ekka ekoa eoka f--k faaa faac faca facc face fack fafa fafc fafe faff fafo fake fako fcca fccf feaf feak fece feck feek fefc fefe feff fefo feke feko feof ffcc ffee ffff foaf foak foca foce fock foco fofo foke foof fook kaaa kaaf kaak kacc kace kaco kaeo kafa kafc kafe kaff kaka kakc kake kakk kako kaoa kaoc kaok kcaa kcac kcca kccc kcck kcea kcec kcee kceo kcfa kcfc kcfo kckc kckf kckk kcko kcoe kcof kea- keak keca keck keco keef keek kefa kefc keff keka kekc keke keko keok kfac kfcf kfco kffa kfff kffk kfka kfok kfoo kkaa kkac kkck kkco kkea kkkk kkoa kkoo koac koae koak koca kocf kock koea kofa kofc kofe koff kofk kofo koka kokc koke kokf kokk koko kooc kook kooo o-eo oafc oafo oake ocac ocak occa occc oce ocee ocef ocfa ocke oec- oeca oecc oeec ofek off- offa offc offe offo okak okka okko okok ooaa ooak ooff oooo