a-ak a-be aaaa aaab aaac aaae aaba aabb aabc aabt aaca aacb aacc aace aack aact aaea aaec aage aaka aake aata aatc aatk aatt abaa abab abac abae abag abak abat abb- abba abbb abbe abbt abca abcb abcc abct abec abee abet abta ac-t acaa acab acac acae acag acat acba acca accc acce acct ace- acea acec acek acet acga acke acta actc acte actg actt aeac aecb aect aega aeka aeta aetc aett agac agag agat agba agca agcc agce agct agea agee aget agga agge agta agte akaa akae akca akee akeg akka akte at-t ataa atab atac atae atak atat atca atcc atck atea atec atee atka atkt atta atte baaa baak baat baba babb babe bac- baca bacc bace back bact baek baga bage bagg bagt bak- baka bake bakt bata batc bate batt bbbb bbeb bbet bbga bcaa bcat bcbc bcbg bcca bccc bcec bcet bctc beag beak beat beba bebb bebe beca beck beeb beeg beek beet bega begg beka beke beta betc bete bett bgca btaa btcc btec btek bttb caaa caab caac caat caba cabe cabg cac- caca cacc cace cack caec caga cage cagg caka cake cat- cata catb catc cate catt cbac cbat cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbga cbgb cbka cbkg cbta cbtc ccaa ccab ccac ccag ccat ccba ccbc ccca cccb cccc ccee ccga ccgc ccgt cctb cctc cctt ceac ceat ceba cec- ceca cece cect ceeb ceec cege ceke cet- ceta cete cgac cgcc cgcg ckac ckat ckbc ckbe ckck ckga cktb ctab ctae ctag ctba ctca ctec ctge ctta eaba eaca eacc eaec eaga eage eata eate ebac ebba ebbc ebcc ecaa ecac ecat ecbc ecbe ecca eccb eccc ecce ecct ecka ect- ecta ectc eeca eeea eeee eega eeka eeke eeta eetc eete egaa egae egat egba egbe egcc egcg egea egec egee eggb egge egta egte egtk eka- ekab ekeb ekek eket ekka ekta etag etak etat etbc etcc etec etee etka etta ette gaba gabb gabe gabt gace gack gaea gaec gaga gage gagg gata gatc gate gatt gbag gc-c gcaa gcat gcbc gccc gcet gctc geab geat geba gebe geca gece geck geek geet gege gegg geta getb gete getg getk gett ggbt gggg gtaa gtea gtta kaaa kaab kaag kaak kaat kaba kabb kabc kabe kabg kacb kacc kace kact kaet kag- kaga kagb kagc kage kagg kagt kaka kakc kake kakk kakt kat- kata katb katc kate katg katk katt kbaa kbab kbac kbae kbak kbat kbba kbbb kbbc kbbe kbbg kbbk kbbt kbca kbcb kbce kbck kbct kbeb kbec kbee kbek kbet kbga kbgb kbge kbgg kbgt kbkb kbkg kbkk kbta kbtb kbtc kbte kbtk kbtt kcaa kcab kcac kcat kcba kcbc kcbk kcca kccb kccc kcck kcct kcea kceb kcec kcee kceg kcet kcgc kckc kckk kcta kctb kctc kcte kea- keag keak keat keba kebb kebc kebe kebt keca kecg keck keek keet kega kege kegg kegk keka kekb kekc keke ket- keta ketc kete ketk kett kgab kgac kgak kgba kgbb kgbc kgbt kgcb kgcc kgce kgeb kgec kget kgga kggg kgtk kkaa kkac kkag kkat kkba kkbb kkbe kkbg kkbt kkcb kkck kkct kkea kkeg kkgb kkkk kktc kktk ktaa ktae ktag ktak ktat ktba ktbb ktbc ktbg ktbt ktcc ktce ktck ktea ktec ktee kteg ktek ktga ktge ktgg ktkb ktkc ktke ktkk ktkt kttc kttg kttk kttt taa- taag taat taba tabb tabc tabe taca tacc tace tack tact taec taga tage tagg taka take takk takt tata tatb tate tatt tbca tbcb tbcc tbce tbta tcca tccc tcga tctc teac teak teat teba teca teck tect teec teek teet tega tegg tegt teka teke teta tete tett tgcc tgtc tkac tkkg ttab ttbb ttkg tttt