aaaa aaab aaam aaar aaba aabb aabm aama aamb aamo aamr aaoo aara aarm aaro abaa abab abam abar abb- abba abbb abbo abbr abma abmb aboa abob aboo abor abra abro amaa amam amar amb- amba ambo ambr amm- amma ammo amob amoo amor amra amro aoba aoma aora aorb arab aram arar arba arma armm armo aroa arob arom aroo aror arr- arra arro arrr baaa baam baar baba babb babm babo babr bama bamb bamm bar- bara barb barm baro barr bbbb bmaa boab boar boba bobb bobo boma bomb boob boom boor bor- bora borm boro borr brab bram brao broa brob brom broo bror brrm brrr maaa maam maar maba mabo mama mamo maor mar- mara marm maro marr mbam mbba mmaa mmab mmar mmmm mmor moaa moab moam moar moba mobb mobo moma momo mooa moob moor mora morb moro mrbb mrbm oama oara obba obbo obor obra obro omam omao omar ombo omma omo- omoa omoo omor omra omro ooaa ooba ooma oooo oora orab oram orao orar orba orbb orbo orma ormo oro- orom oror orra orro raab raam raba rabb rabo rama ramb ramm ramo raob raom rara rarb raro rbbb rbbr roab roam roar rob- roba robb robo roma romb romm romo roob room roor rora roro rrrr