a-be aaaa aaab aaae aaaf aaba aabb aabt aaea aafa aafb aaff aaoe aaoo aata aatf aatt abaa abab abae abaf abat abb- abba abbb abbe abbo abbt abee abet abff aboa abob abof aboo abot abta aeaf aeta aetf aeto aett afaa afao afat afee afet affa affo afft afoa afoe afoo afta afte aoba aotf at-t ataa atab atae atat atea atee atef ateo atfb atfe atob atoe atof atot atta atte atto baaa baaf baat baba babb babe babo baff bafo baft bata bate batf bato batt bbbb bbeb bbet beaf beat beba bebb bebe bebo beeb beef beet befa befe beff befo beft beo- beof beot beta bete beto bett bfta bftt boab boat boba bobb bobe bobo boea boee boef boeo boet bofa bofe boff boob booe boof boot bota botb bote boto bott btaa btaf btob bttb eaaf eaba eafb eata eate ebba ebbo eboe eboo eeea eeee eefa eefe eeta eete efab efeo efet effa eft- efta eota eoto etat etee etfa etfb etfe etoe etta ette etto faaa faba fabe fabo faeb fafa fafe faff fafo fata fate fatf fato fatt feaf feat feba febo feeb feet fefe feff fefo feof feta fete fett ffee ffff fftf foaf foba fobt fofo foof foot fota fote foto fott ftea o-eo oafo oate obba obbo obea obet oboe obot oeta off- offa offe offo ofta ooaa ooba oobe ooff oooo ootb otea otee oto- otoe otof otoo otta otte otto taa- taaf taat taba tabb tabe tabo tafa tafe taff tafo taft taoa tata tatb tate tato tatt tbaf tbta teat teba tebo teef teet teff teft teta tete teto tett tfae tfeb tfot toab toat toba tobe tobo tobt toea toee toet tofa toff tofo toft tooa toof toot tota tote toto tott ttab ttbb tteo ttfa ttff ttoe tttt