aaaa aaab aaaf aaam aaar aaba aabb aabm aafa aafb aaff aama aamb aamo aamr aaoo aara aarm aaro abaa abab abaf abam abar abb- abba abbb abbo abbr abff abma abmb aboa abob abof aboo abor abra abro afaa afam afao afar affa affo afma afoa afoo afor afr- afra afrm afro amaa amam amar amb- amba ambo ambr amfm amfr amm- amma ammo amob amof amoo amor amra amro aoba aoma aora aorb arab araf aram arar arba arfa arfb arff arma armm armo aroa arob arom aroo aror arr- arra arro arrr baaa baaf baam baar baba babb babm babo babr baff bafo bama bamb bamf bamm bar- bara barb barf barm baro barr bbbb bmaa boab boar boba bobb bobo bofa boff boma bomb boob boof boom boor bor- bora borf borm boro borr brab braf bram brao brfm broa brob brom broo bror brrm brrr faaa faam faba fabm fabo fafa faff fafo fama famo fara farb farm faro farr fbar fbom ffar ffff ffrr foaf foam foar foba fofo foma fomo foof foom for- fora forb form foro forr frab fram frob from maaa maaf maam maar maba mabo mafa mafb maff mama mamf mamo maor mar- mara marf marm maro marr mbam mbba mfbm mffa mfor mmaa mmab mmar mmff mmmm mmor mmrf moaa moab moaf moam moar moba mobb mobo mofa moff mofo moma momo mooa moob moor mora morb morf moro mrbb mrbm oafo oama oara obba obbo obor obra obro off- offa offo offr ofor ofra omam omao omar ombo omma omo- omoa omoo omor omra omro ooaa ooba ooff ooma oooo oora orab oram orao orar orba orbb orbo orff orma ormo oro- orof orom oror orra orro raab raaf raam raba rabb rabo rafa raff rama ramb ramm ramo raob raom rara rarb rarf raro rbaf rbbb rbbr rfam rmaf roab roaf roam roar rob- roba robb robo roff rofo roma romb romm romo roob roof room roor rora roro rrrr