a-be aaaa aaab aaae aaba aabb aabt aaea aaoe aaoo aata aatt abaa abab abae abat abb- abba abbb abbe abbo abbt abee abet aboa abob aboo abot abta aeta aeto aett aoba at-t ataa atab atae atat atea atee ateo atob atoe atot atta atte atto baaa baat baba babb babe babo bata bate bato batt bbbb bbeb bbet beat beba bebb bebe bebo beeb beet beo- beot beta bete beto bett boab boat boba bobb bobe bobo boea boee boeo boet boob booe boot bota botb bote boto bott btaa btob bttb eaba eata eate ebba ebbo eboe eboo eeea eeee eeta eete eota eoto etat etee etoe etta ette etto o-eo oate obba obbo obea obet oboe obot oeta ooaa ooba oobe oooo ootb otea otee oto- otoe otoo otta otte otto taa- taat taba tabb tabe tabo taoa tata tatb tate tato tatt tbta teat teba tebo teet teta tete teto tett toab toat toba tobe tobo tobt toea toee toet tooa toot tota tote toto tott ttab ttbb tteo ttoe tttt