a-be aaaa aaab aaae aaar aaav aaba aabb aaea aaev aara aare aaru aava abaa abab abae abar abau abb- abba abbb abbe abbr abee aber abra abua abue abva aeer aer- aera aeva arab arae arar arau arba arbe area aree areu arev arr- arra arre arrr arru arua arub arue arva arve auaa aube auer aur- aura aure auve avab avar avea aver aveu avra avre avur avva baaa baar baba babb babe babr babu baer bar- bara barb bare barr baru bau- baur bava bave bavu bbau bbbb bbeb bear beau beav beba bebb bebe beeb beer bera bere berr beru beur brab brae brau brav brea breb bree brer brev brrr brue bruv buar buba bubb bube bubu buea buer bueu bur- bura burb bure burr buru buve eaba eara earb eare eave ebba ebbr eber ebru ebur eeea eeee eera eeva erau erba erbb erbe ereb erer erev erra erre erua erub erur eruv erve euba euer eur- eura eure evae evar evea ever evra evre raab raba rabb rabe rabu raer rara rarb rare raua raub raue rava rave rbbb rbbr rea- reae rear reau reba rebb rebe rebu reeb reev rera rere reru reue reuu reva reve rrrr ruba rubb rube rubu ruer rura rure ruru ruve ruvu rver uaru uaua ubar ubba ubbe uber ubra ueba urau urba urbe ure- urea urra urre urur urva urve uuuu uv-a uv-b uvaa uvae uvea uver uvvu vaar vara vare varr varu vava vear veau veba veer ver- vera verb vere veur veve vrav vrba vurb vver vvvv