a-be aaaa aaab aaae aaaf aaar aaba aabb aaea aafa aafb aaff aaoe aaoo aara aare aaro abaa abab abae abaf abar abb- abba abbb abbe abbo abbr abee aber abff aboa abob abof aboo abor abra abro aeaf aeer aer- aera aero afaa afao afar afee afer affa affo afoa afoe afoo afor afr- afra afre afro aoba aora aorb arab arae araf arar arba arbe area aree aref areo arfa arfb arff aroa arob aroe aroo aror arr- arra arre arro arrr baaa baaf baar baba babb babe babo babr baer baff bafo bar- bara barb bare barf baro barr bbbb bbeb beaf bear beba bebb bebe bebo beeb beef beer befa befe beff befo beo- beof beor bera bere bero berr boab boar boba bobb bobe bobo boea boee boef boeo boer bofa bofe boff boob booe boof boor bor- bora bore borf boro borr brab brae braf brao brea breb bree bref breo brer broa brob broe broo bror brrr eaaf eaba eafb eara earb eare earo ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eefa eefe eera eero efab efbr efeo effa efor eora eore eraf erba erbb erbe ereb erer erob eroe eroo erra erre erro faaa faba fabe fabo faeb fafa fafe faff fafo fara farb fare faro farr fbar feaf fear feba febo feeb feer fefe feff fefo feof fera ferb fere fero ferr ffar ffee ffff ffrr foaf foar foba foer fofo foof for- fora forb fore foro forr frab frae frea free freo frob froe o-eo oaer oafo oara oare obba obbo obea ober oboe obor obra obre obro oera oere ofer off- offa offe offo offr ofor ofra ofre ooaa ooba oobe ooer ooff oooo oora oore orab orae orao orar orba orbb orbe orbo ore- orea oreb oreo orer orfe orff oro- oroe orof oror orra orro raab raaf raba rabb rabe rabo raef raer rafa rafe raff raob rara rarb rare rarf raro rbaf rbbb rbbr rea- reae reaf reao rear reba rebb rebe rebo reeb reef refe reff refr reof rera rere rero rfae rfef roab roaf roar rob- roba robb robe robo roea roer rofe roff rofo roob roof roor rora rore roro rrrr