a-be aaaa aaab aaae aaar aaav aaba aabb aaea aaev aara aare aava abaa abab abae abar abb- abba abbb abbe abbr abee aber abra abva aeer aer- aera aeva arab arae arar arba arbe area aree arev arr- arra arre arrr arva arve avab avar avea aver avra avre avva baaa baar baba babb babe babr baer bar- bara barb bare barr bava bave bbbb bbeb bear beav beba bebb bebe beeb beer bera bere berr brab brae brav brea breb bree brer brev brrr eaba eara earb eare eave ebba ebbr eber eeea eeee eera eeva erba erbb erbe ereb erer erev erra erre erve evae evar evea ever evra evre raab raba rabb rabe raer rara rarb rare rava rave rbbb rbbr rea- reae rear reba rebb rebe reeb reev rera rere reva reve rrrr rver vaar vara vare varr vava vear veba veer ver- vera verb vere veve vrav vrba vver vvvv