a-be aaaa aaab aaae aaam aaba aabb aabm aaea aaem aama aamb aame aamo aaoe aaoo abaa abab abae abam abb- abba abbb abbe abbo abee abma abmb aboa abob aboo aeom amaa amae amam amb- amba ambe ambo amee amm- amma amme ammo amob amoo aoba aoma baaa baam baba babb babe babm babo bama bamb bame bamm bbbb bbeb beam beba bebb bebe bebo beeb beem bema beme beo- bmaa boab boba bobb bobe bobo boea boee boeo boma bomb bome boob booe boom eaba eama eame eaom ebam ebba ebbo eboe eboo eeea eeee eemo emae emam emba embe embo emma emme maaa maam maba mabe mabo maee maem maeo mama mame mamo mbam mbba mebe mebo meem mema meme memo mmaa mmab mmea mmmm moaa moab moam moba mobb mobe mobo moea moma mome momo mooa moob mooe o-eo oama obba obbo obea oboe oeme omam omao ombe ombo omee omeo omma omo- omoa omoe omoo ooaa ooba oobe ooma oome oooo