a-ak aaaa aaab aaar aaba aabb aabt aaka aara aart aata aatk aatt abaa abab abak abar abat abb- abba abbb abbr abbt abra abta akaa akar akka akr- akra arab arak arar arat arba arka arr- arra arrk arrr arrt arta artr at-t ataa atab atak atar atat atka atkt atra atrk atta attr baaa baak baar baat baba babb babr bak- baka bakr bakt bar- bara barb bark barr bart bata batt bbbb brab brak brat brka brkb brrr btaa btrt bttb kaaa kaab kaak kaar kaat kaba kabb kabr kaka kakk kakt kara karb kark karr kart kat- kata katb katk katr katt kbaa kbab kbak kbar kbat kbba kbbb kbbk kbbr kbbt kbkb kbkk kbkr kbra kbrb kbrk kbrt kbta kbtb kbtk kbtr kbtt kkaa kkar kkat kkba kkbb kkbr kkbt kkkk kkrb kkrk kkrr kkrt kktk krab krak krar krat krba krbb krbk krbr krbt krka krkk krkr krrb krrk krrr krrt krta krtk krtr ktaa ktak ktar ktat ktba ktbb ktbr ktbt ktkb ktkk ktkr ktkt ktrb ktrk ktrr ktrt kttk kttr kttt raab raak raat raba rabb rabk raka rakk rakt rara rarb rark rata ratk ratt rbbb rbbr rrat rrrr taa- taar taat taba tabb taka takk takt tara tarb tark tarr tart tata tatb tatr tatt tbar tbrb tbta traa trab trak trat trra trtr ttab ttbb tttt