a-ak aaaa aaab aaac aaba aabb aabc aabt aaca aacb aacc aack aact aaka aata aatc aatk aatt abaa abab abac abag abak abat abb- abba abbb abbt abca abcb abcc abct abta ac-t acaa acab acac acag acat acba acca accc acct acga acta actc actg actt agac agag agat agba agca agcc agct agga agta akaa akca akka at-t ataa atab atac atak atat atca atcc atck atka atkt atta baaa baak baat baba babb bac- baca bacc back bact baga bagg bagt bak- baka bakt bata batc batt bbbb bbga bcaa bcat bcbc bcbg bcca bccc bctc bgca btaa btcc bttb caaa caab caac caat caba cabg cac- caca cacc cack caga cagg caka cat- cata catb catc catt cbac cbat cbbc cbca cbcc cbct cbga cbgb cbka cbkg cbta cbtc ccaa ccab ccac ccag ccat ccba ccbc ccca cccb cccc ccga ccgc ccgt cctb cctc cctt cgac cgcc cgcg ckac ckat ckbc ckck ckga cktb ctab ctag ctba ctca ctta gaba gabb gabt gack gaga gagg gata gatc gatt gbag gc-c gcaa gcat gcbc gccc gctc ggbt gggg gtaa gtta kaaa kaab kaag kaak kaat kaba kabb kabc kabg kacb kacc kact kag- kaga kagb kagc kagg kagt kaka kakc kakk kakt kat- kata katb katc katg katk katt kbaa kbab kbac kbak kbat kbba kbbb kbbc kbbg kbbk kbbt kbca kbcb kbck kbct kbga kbgb kbgg kbgt kbkb kbkg kbkk kbta kbtb kbtc kbtk kbtt kcaa kcab kcac kcat kcba kcbc kcbk kcca kccb kccc kcck kcct kcgc kckc kckk kcta kctb kctc kgab kgac kgak kgba kgbb kgbc kgbt kgcb kgcc kgga kggg kgtk kkaa kkac kkag kkat kkba kkbb kkbg kkbt kkcb kkck kkct kkgb kkkk kktc kktk ktaa ktag ktak ktat ktba ktbb ktbc ktbg ktbt ktcc ktck ktga ktgg ktkb ktkc ktkk ktkt kttc kttg kttk kttt taa- taag taat taba tabb tabc taca tacc tack tact taga tagg taka takk takt tata tatb tatt tbca tbcb tbcc tbta tcca tccc tcga tctc tgcc tgtc tkac tkkg ttab ttbb ttkg tttt