a-ak a-be aaaa aaab aaac aaae aaba aabb aabc aabt aaca aacb aacc aace aack aact aaea aaec aaka aake aata aatc aatk aatt abaa abab abac abae abak abat abb- abba abbb abbe abbt abca abcb abcc abct abec abee abet abta ac-t acaa acab acac acae acat acba acca accc acce acct ace- acea acec acek acet acke acta actc acte actt aeac aecb aect aeka aeta aetc aett akaa akae akca akee 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 bak- baka bake bakt bata batc bate batt bbbb bbeb bbet bcaa bcat bcbc bcca bccc bcec bcet bctc beak beat beba bebb bebe beca beck beeb beek beet beka beke beta betc bete bett btaa btcc btec btek bttb caaa caab caac caat caba cabe cac- caca cacc cace cack caec caka cake cat- cata catb catc cate catt cbac cbat cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbka cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc ccee cctb cctc cctt ceac ceat ceba cec- ceca cece cect ceeb ceec ceke cet- ceta cete ckac ckat ckbc ckbe ckck cktb ctab ctae ctba ctca ctec ctta eaba eaca eacc eaec eata eate ebac ebba ebbc ebcc ecaa ecac ecat ecbc ecbe ecca eccb eccc ecce ecct ecka ect- ecta ectc eeca eeea eeee eeka eeke eeta eetc eete eka- ekab ekeb ekek eket ekka ekta etak etat etbc etcc etec etee etka etta ette kaaa kaab kaak kaat kaba kabb kabc kabe kacb kacc kace kact kaet kaka kakc kake kakk kakt kat- kata katb katc kate katk katt kbaa kbab kbac kbae kbak kbat kbba kbbb kbbc kbbe kbbk kbbt kbca kbcb kbce kbck kbct kbeb kbec kbee kbek kbet kbkb kbkk kbta kbtb kbtc kbte kbtk kbtt kcaa kcab kcac kcat kcba kcbc kcbk kcca kccb kccc kcck kcct kcea kceb kcec kcee kcet kckc kckk kcta kctb kctc kcte kea- keak keat keba kebb kebc kebe kebt keca keck keek keet keka kekb kekc keke ket- keta ketc kete ketk kett kkaa kkac kkat kkba kkbb kkbe kkbt kkcb kkck kkct kkea kkkk kktc kktk ktaa ktae ktak ktat ktba ktbb ktbc ktbt ktcc ktce ktck ktea ktec ktee ktek ktkb ktkc ktke ktkk ktkt kttc kttk kttt taa- taat taba tabb tabc tabe taca tacc tace tack tact taec taka take takk takt tata tatb tate tatt tbca tbcb tbcc tbce tbta tcca tccc tctc teac teak teat teba teca teck tect teec teek teet teka teke teta tete tett tkac ttab ttbb tttt