a-be aaaa aaab aaae aaav aaba aabb aabt aaea aaev aaoe aaoo aata aatt aava abaa abab abae abat abb- abba abbb abbe abbo abbt abee abet aboa abob aboo abot abov abta abva aeta aeto aett aeva aoba at-t ataa atab atae atat atea atee ateo atob atoe atot atta atte atto avab avao avat avea aveo avot avva avvo baaa baat baba babb babe babo bata bate bato batt bava bave bbbb bbeb bbet beat beav beba bebb bebe bebo beeb beet beo- beot beta bete beto bett betv bevo boab boat boba bobb bobe bobo boea boee boeo boet boob booe boot bota botb bote boto bott bova bove bovo btaa btob bttb eaba eata eate eave ebba ebbo eboe eboo eeea eeee eeta eete eeva eota eoto etat etee etoe etta ette etto etvo evae evat evea evet evoe evoo o-eo oate obba obbo obea obet oboe obot oeta ooaa ooba oobe oooo ootb otea otee oto- otoe otoo otov otta otte otto ovee ovet ovo- ovoo ovot taa- taat taba tabb tabe tabo taoa tata tatb tate tato tatt tatv tava tave tavo tbta teat teba tebo teet teev teta tete teto tett teva toab toat toba tobe tobo tobt toea toee toet tooa toot tota tote toto tott tova tove tovo ttab ttbb tteo ttoe tttt tvtv vaat vata vate vato vatt vava veat veba veet veta vete veto veve vevo voat voet voot vota vote voto vvob vvvv