a-be aaaa aaab aaae aaaf aaam aaar aaba aabb aabm aaea aaem aafa aafb aaff aama aamb aame aamr aara aare aarm abaa abab abae abaf abam abar abb- abba abbb abbe abbr abee aber abff abma abmb abra aeaf aeer aer- aera afaa afam afar afee afer affa afma afr- afra afre afrm amaa amae amam amar amb- amba ambe ambr amee amer amfm amfr amm- amma amme amra arab arae araf aram arar arba arbe area aree aref arem arfa arfb arff arma arme armm arr- arra arre arrr baaa baaf baam baar baba babb babe babm babr baer baff bama bamb bame bamf bamm bar- bara barb bare barf barm barr bbbb bbeb beaf beam bear beba bebb bebe beeb beef beem beer befa befe beff bema beme bera bere berm berr bfme bmaa brab brae braf bram brea breb bree bref brem brer brfm brrm brrr eaaf eaba eafb eama eame eara earb eare ebam ebba ebbr eber eeea eeee eefa eefe eera efab efbr effa efma emae emam emar emba embe embr emer emma emme emra emre eraf eram erba erbb erbe ereb erem erer erma erme erra erre faaa faam faba fabe fabm faeb faem fafa fafe faff fama fame fara farb fare farm farr fbar feaf feam fear feba feeb feem feer fefe feff fema femb feme femm fera ferb fere ferm ferr ffar ffee ffff ffrr fmea frab frae fram frea free frem maaa maaf maam maar maba mabe maee maem maer mafa mafb maff mama mame mamf mar- mara mare marf marm marr mbam mbba mear mebe meef meem meer mefe meff mema meme memr mer- mera merb mere merf merm mfbm mffa mmaa mmab mmar mmea mmff mmmm mmrf mrbb mrbm mreb mree raab raaf raam raba rabb rabe raef raer rafa rafe raff rama ramb rame ramm rara rarb rare rarf rbaf rbbb rbbr rea- reae reaf ream rear reba rebb rebe reeb reef reem refe reff refr rema reme rera rere rfae rfam rfef rfem rmaf rrrr