a-ak a-be aaaa aaab aaae aaar aaba aabb aaea aaka aake aara aare abaa abab abae abak abar abb- abba abbb abbe abbr abee aber abra aeer aeka aer- aera akaa akae akar akee aker akka akr- akra akre arab arae arak arar arba arbe area aree arek arka arke arr- arra arre arrk arrr baaa baak baar baba babb babe babr baek baer bak- baka bake bakr bar- bara barb bare bark barr bbbb bbeb beak bear beba bebb bebe beeb beek beer beka beke bera bere berk berr brab brae brak brea breb bree brek brer brka brkb brrr eaba eara earb eare ebba ebbr eber eeea eeee eeka eeke eera eka- ekab ekeb ekek eker ekka erba erbb erbe ereb erer erke erra erre kaaa kaab kaak kaar kaba kabb kabe kabr kaer kaka kake kakk kara karb kare kark karr kbaa kbab kbae kbak kbar kbba kbbb kbbe kbbk kbbr kbeb kbee kbek kber kbkb kbkk kbkr kbra kbrb kbre kbrk kea- keak kear keba kebb kebe kebr keek keer keka kekb keke ker- kera kerb kere kerk kerr kkaa kkar kkba kkbb kkbe kkbr kkea kkkk kkrb kkre kkrk kkrr krab krae krak krar krba krbb krbe krbk krbr krea kreb kree krek krka krke krkk krkr krrb krre krrk krrr raab raak raba rabb rabe rabk raer raka rake rakk rara rarb rare rark rbbb rbbr rea- reae reak rear reba rebb rebe rebk reeb reek reka reke rera rere rrrr