a-be aaaa aaab aaae aaar aaba aabb aaea aara aare aaru abaa abab abae abar abau abb- abba abbb abbe abbr abee aber abra abua abue aeer aer- aera aqar aqra aqu- aqua aque arab arae araq arar arau arba arbe area aree areu arq- arqa arr- arra arre arrr arru arua arub arue aruq auaa aube auer aur- aura aure baaa baar baba babb babe babr babu baer baqa bar- bara barb bare barq barr baru bau- baur bbau bbbb bbbq bbeb bear beau beba bebb bebe beeb beer beqa bera bere berr beru beur bque brab brae brau brea breb bree brer brrr brue buar buba bubb bube bubq bubu buea buer bueu buqa bur- bura burb bure burr buru eaba eara earb eare ebba ebbr eber ebru ebur eeea eeee eera equ- equa eque erau erba erbb erbe ereb erer erra erre erua erub erur euba euer eur- eura eure q-be qara qare qaru qere qerq qqqq quaa quab quae quar quba qube quee quer quu- raab raba rabb rabe rabu raer rara rarb rare raua raub raue rbbb rbbr rea- reae rear reau reba rebb rebe rebu reeb reqa rera rere reru reue reuu rrrr ruba rubb rube rubu ruer rura rure ruru uaru uaua ubar ubba ubbe uber ubra ueba uqar urau urba urbe ure- urea urra urre uruq urur uuuu