a-be aaaa aaab aaac aaae aaba aabb aabc aabt aaca aacb aacc aace aaco aact aaea aaec aaoe aaoo aata aatc aatt abaa abab abac abae abat abb- abba abbb abbe abbo abbt abca abcb abcc abct abec abee abet aboa abob aboo abot abta ac-t acaa acab acac acae acat acba acca accc acce acco acct ace- acea acec acet acoa acoe acot acta actc acte acto actt aeac aecb aect aeta aetc aeto aett aoba aoca aoce aotc at-t ataa atab atac atae atat atca atcc atco atea atec atee ateo atob atoc atoe atot atta atte atto baaa baat baba babb babe babo bac- baca bacc bace baco bact bata batc bate bato batt bbbb bbeb bbet bcaa bcat bcbc bcca bccc bcec bcet bctc beat beba bebb bebe bebo beca beeb beet beo- beot beta betc bete beto bett boab boac boat boba bobb bobe bobo boca boce boco boea boec boee boeo boet boob booc booe boot bota botb bote boto bott btaa btcc btec btob bttb c-bo caaa caab caac caat caba cabe cabo cac- caca cacc cace caco caec cat- cata catb catc cate cato catt cbac cbat cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbot cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc ccee ccob ccoc cctb cctc cctt ceac ceat ceba cec- ceca cece ceco cect ceeb ceec cet- ceta cete ceto coat coba cobb cobe cobo coca coce coco coct coob coot cota cotb cotc cote coto cott ctab ctae ctba ctca ctec ctot ctta eaba eaca eacc eaec eata eate ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecat ecbc ecbe ecca eccb eccc ecce ecco ecct eco- ecot ect- ecta ectc ecto eeca eeea eeee eeoc eeta eetc eete eota eotc eoto etat etbc etcc etco etec etee etoe etta ette etto o-eo oate obba obbo obea obec obet oboe obot ocab ocac ocat ocbc occa occc occt oce ocee ocet oct- octa octe octo oec- oeca oecc oeec oeta ooaa ooba oobe oooo ootb otac otea otee oto- otoe otoo otta otte otto taa- taat taba tabb tabc tabe tabo taca tacc tace taco tact taec taoa tata tatb tate tato tatt tbca tbcb tbcc tbce tbta tcca tccc tctc teac teat teba tebo teca teco tect teec teet teta tete teto tett toab toat toba tobe tobo tobt toca toce toco toea toee toet tooa toot tota totc tote toto tott ttab ttbb tteo ttoe tttt