a-be aaaa aaab aaae aaba aabb aabt aaea aaoe aaoo aata aatt abaa abab abae abat abau abb- abba abbb abbe abbo abbt abee abet aboa abob aboo abot abou abta abtu abua abue abut aeta aeto aett aoba aoeu aout at-t ataa atab atae atat atea atee ateo atob atoe atot atta atte atto attu atua atub auaa aube aut- aute auto baaa baat baba babb babe babo babu bata bate bato batt batu bau- bbau bbbb bbeb bbet beat beau beba bebb bebe bebo beeb beet beo- beot beta bete beto bett betu boab boat boba bobb bobe bobo bobu boea boee boeo boet boob booe boot bota botb bote boto bott boua boue bout btaa btob bttb buat buba bubb bube bubo bubu buea bueu but- buta bute buto butt eaba eata eate ebba ebbo eboe eboo eeea eeee eeta eete eetu eota eoto etat etee etoe etta ette etto ettu etua euba o-eo oaau oate obba obbo obea obet oboe obot oeta ooaa ooba oobe oooo ootb otea otee oto- otoe otoo otta otte otto ottu ouat ouea out- outa outb oute outo ouu- taa- taat taba tabb tabe tabo tabu taoa taou tata tatb tate tato tatt tatu taua taub taue taut tbta teat teba tebo tebu teet teta tete teto tett tetu teut toab toat toau toba tobe tobo tobt tobu toea toee toet tooa toot tota tote toto tott tout ttab ttbb tteo ttoe tttt tuae tuao tuat tuba tubb tube tubo tubu tuet tuta tute tuto tutt tutu tuuo uata uatu uaua ubba ubbe ubbo ubet ueba utau utto uttu uuta uuuu