a-ak aaaa aaab aaac aaba aabb aabc aabt aaca aacb aacc aack aact aaka aata aatc aatk aatt abaa abab abac abak abat abb- abba abbb abbt abca abcb abcc abct abta ac-t acaa acab acac acat acba acca accc acct acta actc actt 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 bak- baka bakt bata batc batt bbbb bcaa bcat bcbc bcca bccc bctc btaa btcc bttb caaa caab caac caat caba cac- caca cacc cack caka cat- cata catb catc catt cbac cbat cbbc cbca cbcc cbct cbka cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cctb cctc cctt ckac ckat ckbc ckck cktb ctab ctba ctca ctta kaaa kaab kaak kaat kaba kabb kabc kacb kacc kact kaka kakc kakk kakt kat- kata katb katc katk katt kbaa kbab kbac kbak kbat kbba kbbb kbbc kbbk kbbt kbca kbcb kbck kbct kbkb kbkk kbta kbtb kbtc kbtk kbtt kcaa kcab kcac kcat kcba kcbc kcbk kcca kccb kccc kcck kcct kckc kckk kcta kctb kctc kkaa kkac kkat kkba kkbb kkbt kkcb kkck kkct kkkk kktc kktk ktaa ktak ktat ktba ktbb ktbc ktbt ktcc ktck ktkb ktkc ktkk ktkt kttc kttk kttt taa- taat taba tabb tabc taca tacc tack tact taka takk takt tata tatb tatt tbca tbcb tbcc tbta tcca tccc tctc tkac ttab ttbb tttt