a-be aaaa aaab aaae aaaf aaam aaba aabb aabm aaea aaem aafa aafb aaff aama aamb aame aamo aaoe aaoo abaa abab abae abaf abam abb- abba abbb abbe abbo abee abff abma abmb aboa abob abof aboo aeaf aeom afaa afam afao afee affa affo afma afoa afoe afoo amaa amae amam amb- amba ambe ambo amee amfm amm- amma amme ammo amob amof amoo aoba aoma baaa baaf baam baba babb babe babm babo baff bafo bama bamb bame bamf bamm bbbb bbeb beaf beam beba bebb bebe bebo beeb beef beem befa befe beff befo bema beme beo- beof bfme bmaa boab boba bobb bobe bobo boea boee boef boeo bofa bofe boff boma bomb bome boob booe boof boom eaaf eaba eafb eama eame eaom ebam ebba ebbo eboe eboo eeea eeee eefa eefe eemo efab efeo effa efma emae emam emba embe embo emma emme faaa faam faba fabe fabm fabo faeb faem fafa fafe faff fafo fama fame famo fbom feaf feam feba febo feeb feem fefe feff fefo fema femb feme femm feof ffee ffff fmea foaf foam foba fofo foma fome fomo foof foom maaa maaf maam maba mabe mabo maee maem maeo mafa mafb maff mama mame mamf mamo mbam mbba mebe mebo meef meem mefe meff mefo mema meme memo mfbm mffa mmaa mmab mmea mmff mmmm moaa moab moaf moam moba mobb mobe mobo moea moef mofa mofe moff mofo moma mome momo mooa moob mooe o-eo oafo oama obba obbo obea oboe oeme ofem off- offa offe offo ofme omam omao ombe ombo omee omeo omma omo- omoa omoe omoo ooaa ooba oobe ooff ooma oome oooo