a-ak a-be a-ya aaaa aaab aaac aaae aaaf aaba aabb aabc aaby aaca aacb aacc aace aacf aack aacy aaea aaec aafa aafb aafc aaff aaka aake abaa abab abac abae abaf abak abay abb- abba abbb abbe abby abca abcb abcc abcf abec abee abey abff abyc abye abyy acaa acab acac acae acba acca accc acce accf accy ace- acea acec acek acey acfc acfe acke aeac aeaf aeby aecb aeka afaa afak afca afcb afcc afee afek affa affc affy afka afye akaa akae akay akca akee akey akka ayay ayca ayce ayya baaa baaf baak baba babb babe baby bac- baca bacc bace back baek bafc baff bak- baka bake baya baye bbay bbbb bbeb bbfc bcaa bcbc bcca bccc bcec bcfc beaf beak beay beba bebb bebe beby beca beck beeb beef beek beey befa befe beff beka beke beya beye beyk bfca bkcy byce byck byke caaa caab caac caaf caba cabe cabf caby cac- caca cacc cace cack caec cafa cafb cafc cafe caff caka cake caky caye cbac cbbc cbca cbcc cbce cbea cbec cbee cbef cbfb cbfc cbka ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ceac ceba cec- ceca cece ceeb ceec cef- cefa cefc ceke cfaa cfab cfac cfae cfbc cfca cfcb cfcf cfcy cffb cfyk ckac ckbc ckbe ckck ckcy ckey cya- cyaa cyba cybb cybc cyc- cyca cycb cycc cyfe cyke cyy- cyyc eaaf eaba eaca eacc eaec eafb ebac ebay ebba ebbc ebby ebcc ebfc ebya ecaa ecac ecbc ecbe ecca eccb eccc ecce ecef ecfa ecfc ecka ecky eeby eeca eeea eeee eefa eefe eeka eeke efab efca effa effy efke efya eka- ekab ekeb ekek ekfc ekka eyak eyck eyeb eyec eyey eyke f--k faaa faac faba fabe faca facc face fack facy faeb fafa fafc fafe faff fake faky faya faye fcab fcba fcca fccf feaf feak feba fece feck feeb feek fefc fefe feff feke ffcc ffee ffff fkab fyce fyfe fyke kaaa kaab kaaf kaak kaay kaba kabb kabc kabe kabf kaby kacb kacc kace kacy kafa kafc kafe kaff kafy kaka kakc kake kakk kaya kaye kayf kbaa kbab kbac kbae kbak kbay kbba kbbb kbbc kbbe kbbf kbbk kbca kbcb kbce kbck kbcy kbeb kbec kbee kbef kbek kbey kbfb kbfc kbff kbfk kbkb kbkf kbkk kbky kbya kbyb kcaa kcab kcac kcba kcbc kcbf kcbk kcca kccb kccc kcck kccy kcea kceb kcec kcee kcey kcfa kcfb kcfc kcfy kckc kckf kckk kcky kcya kcye kcyk kcyy kea- keak keay keba kebb kebc kebe keca keck keef keek kefa kefb kefc keff keka kekb kekc keke keya keyb keye keyf keyy kfab kfac kfay kfbc kfbk kfcf kfcy kfeb kffa kffb kfff kffk kfka kfkb kkaa kkac kkay kkba kkbb kkbe kkcb kkck kkcy kkea kkkk kkya kkyc kkyy kyaa kyak kyay kyba kybb kybc kybe kyby kyca kycc kyck kyee kyfb kyka kykc kyke kykk kyky kyya kyyk kyyy yaaf yaak yaba yacc yack yacy yafa yafc yafe yaff yaka yaya ycab yccc ycee yeaf yeck yeek yefe yeff yeka yeke yeye ykey yyfe yyff yyyy