a-be aaaa aaab aaae aaam aaar aaba aabb aabm aaea aaem aama aamb aame aamr aara aare aarm abaa abab abae abam abar abb- abba abbb abbe abbr abee aber abma abmb abra aeer aer- aera amaa amae amam amar amb- amba ambe ambr amee amer amm- amma amme amra arab arae aram arar arba arbe area aree arem arma arme armm arr- arra arre arrr baaa baam baar baba babb babe babm babr baer bama bamb bame bamm bar- bara barb bare barm barr bbbb bbeb beam bear beba bebb bebe beeb beem beer bema beme bera bere berm berr bmaa brab brae bram brea breb bree brem brer brrm brrr eaba eama eame eara earb eare ebam ebba ebbr eber eeea eeee eera emae emam emar emba embe embr emer emma emme emra emre eram erba erbb erbe ereb erem erer erma erme erra erre maaa maam maar maba mabe maee maem maer mama mame mar- mara mare marm marr mbam mbba mear mebe meem meer mema meme memr mer- mera merb mere merm mmaa mmab mmar mmea mmmm mrbb mrbm mreb mree raab raam raba rabb rabe raer rama ramb rame ramm rara rarb rare rbbb rbbr rea- reae ream rear reba rebb rebe reeb reem rema reme rera rere rrrr