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 abax abb- abba abbb abbe abbo abbt abca abcb abcc abct abec abee abet aboa abob aboo abot abox 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 aetx aoba aoca aoce aotc at-t at-x ataa atab atac atae atat atax atca atcc atco atea atec atee ateo atex atob atoc atoe atot atta atte atto axat axce axo- axoa axto axxo ba-x baaa baat baba babb babe babo bac- baca bacc bace baco bact bata batc bate bato batt baxt bbbb bbeb bbet bbox 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 boox bota botb bote boto bott boxa btaa btcc btcx btec btex btob bttb c-bo caaa caab caac caat caba cabe cabo cac- caca cacc cace caco caec caex cat- cata catb catc cate cato catt caxa cbac cbat cbax cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbot cbox cbta cbtc cbxa 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 cexe coat coax coba cobb cobe cobo coca coce coco coct coex coob coot cota cotb cotc cote coto cott coxa coxe ctab ctae ctba ctca ctec ctot ctta cxxx eaba eaca eacc eaec eata eate ebac ebba ebbc ebbo ebcc eboe eboo ebox 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 eext eota eotc eoto etat etbc etcc etco etec etee etoe etox etta ette etto exa- exco exec exo- exta exte o-eo oate obba obbo obea obec obet obex oboe obot obox ocab ocac ocat ocbc occa occc occt oce ocee ocet oct- octa octe octo oeax oec- oeca oecc oeec oeta ooaa ooba oobe oooo ootb otac otea otee oto- otoe otoo otta otte otto oxa- oxea oxo- oxox oxxo taa- taat taba tabb tabc tabe tabo taca tacc tace taco tact taec taoa tata tatb tate tato tatt tax- taxa taxe taxo taxt tbca tbcb tbcc tbce tbox tbta tcca tccc tctc teac teat teba tebo teca teco tect teec teet teta tete teto tett tetx texa text toab toat toba tobe tobo tobt toca toce toco toea toee toet tooa toot tota totc tote toto tott tox- toxa toxo toxt ttab ttbb tteo ttoe tttt txaa xace xact xate xbee xbox xcat xexe xobc xoca xoco xote xoxo xtea xxxo xxxx