a-be aaaa aaab aaae aaar aaba aabb aaea aara aare abaa abab abae abar abb- abba abbb abbe abbr abee aber abra aeer aer- aera aqar aqra arab arae araq arar arba arbe area aree arq- arqa arr- arra arre arrr baaa baar baba babb babe babr baer baqa bar- bara barb bare barq barr bbbb bbbq bbeb bear beba bebb bebe beeb beer beqa bera bere berr brab brae brea breb bree brer brrr eaba eara earb eare ebba ebbr eber eeea eeee eera erba erbb erbe ereb erer erra erre q-be qara qare qere qerq qqqq raab raba rabb rabe raer rara rarb rare rbbb rbbr rea- reae rear reba rebb rebe reeb reqa rera rere rrrr