a-ak aaaa aaab aaap aaar aaba aabb aabp aaka aapa aara aarp abaa abab abak abap abar abb- abba abbb abbr abpa abpp abpr abra akaa akap akar akka akr- akra apak apap apar apba apbr appa appr apra arab arak arap arar arba arka arpa arr- arra arrk arrr baaa baak baar baba babb babr bak- baka bakr bapa bapp bar- bara barb bark barr bbbb bbpr bkpr brab brak brka brkb brrr kaaa kaab kaak kaap kaar kaba kabb kabr kaka kakk kap- kapa kapp kara karb kark karp karr kbaa kbab kbak kbap kbar kbba kbbb kbbk kbbr kbkb kbkk kbkr kbpa kbpk kbpr kbra kbrb kbrk kkaa kkap kkar kkba kkbb kkbr kkkk kkpk kkrb kkrk kkrr kpak kpar kpba kpbb kpbr kpkk kpkr kppk kppp kppr kprb kprk kprp kprr krab krak krap krar krba krbb krbk krbr krka krkk krkr krpa krpr krrb krrk krrr paak paap paar paba paka papa papb papp papr par- para park parp parr pbar pbpa pbpk ppap ppar pppa pppp prar raab raak raba rabb rabk raka rakk rapa rapp rara rarb rark rbbb rbbr rrrr