a-be aaaa aaab aaae aaba aabb aabt aaea aata aatt abaa abab abae abat abau abax abb- abba abbb abbe abbt abee abet abta abtu abua abue abut aeta aett aetx at-t at-x ataa atab atae atat atax atea atee atex atta atte attu atua atub auaa aube aut- aute auxa axat ba-x baaa baat baba babb babe babu bata bate batt batu bau- baux baxt bbau bbbb bbeb bbet beat beau beba bebb bebe beeb beet beta bete bett betu beux btaa btex bttb buat buba bubb bube bubu buea bueu but- buta bute butt buxa eaba eata eate eaux ebba eeea eeee eeta eete eetu eext etat etee etta ette ettu etua etux euba exa- exta exte taa- taat taba tabb tabe tabu tata tatb tate tatt tatu taua taub taue taut tax- taxa taxe taxt tbta teat teba tebu teet teta tete tett tetu tetx teut texa text ttab ttbb tttt tuae tuat tuba tubb tube tubu tuet tuta tute tutt tutu txaa uata uatu uaua ubba ubbe ubet ueba uext utau uttu uuta uuuu uxue xate xbee xexe xtea xuxa xuxu xxxx