a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aaco aacr aact aaea aaec aaoe aaoo aara aarc aare aaro aart aata aatc aatt abaa abab abac abae abar abat abb- abba abbb abbe abbo abbr abbt abca abcb abcc abcr abct abec abee aber abet aboa abob aboo abor abot abra abrc abro abta ac-t acaa acab acac acae acar acat acba acca accc acce acco acct ace- acea acec acer acet acoa acoe acor acot acr- acra acrc acre acro acrr acta actc acte acto actt aeac aecb aect aeer aer- aera aerc aero aeta aetc aeto aetr aett aoba aoca aoce aora aorb aort aotc arab arac arae arar arat arba arbe arc- arca arce arco arct area arec aree areo aret aroa arob aroe aroo aror arr- arra arrc arre arro arrr arrt arta artc arte arto artr at-t ataa atab atac atae atar atat atca atcc atco atcr atea atec atee ateo ater atob atoc atoe ator atot atra atrc atre atro atta atte atto attr baaa baar baat baba babb babe babo babr bac- baca bacc bace baco bact baer bar- bara barb barc bare baro barr bart bata batc bate bato batt bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcor bcra bctc bear beat beba bebb bebe bebo beca beeb beer beet beo- beor beot bera berc bere bero berr bert beta betc bete beto bett boab boac boar boat boba bobb bobe bobo boca boce boco boea boec boee boeo boer boet boob booc booe boor boot bor- bora bore boro borr bort bota botb bote boto bott brab brac brae brao brat brca brcb brce brea breb brec bree breo brer bret broa brob broc broe broo bror brot brrr brtc btaa btcc btec btob btor btrc btrt bttb c-bo caaa caab caac caat caba cabe cabo cac- caca cacc cace caco cacr caec caer caor cara carb carc care caro carr cart cat- cata catb catc cate cato catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbot cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccee ccob ccoc ccra ccrc ccre ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece ceco cect ceeb ceec ceor cer- cera cerc cere cero cert cet- ceta cete ceto coat coba cobb cobe cobo coca coce coco coct coob coot cor- cora corb corc core coro corr cort cota cotb cotc cote coto cott crab crac crar crat crbc crca crcc crce crcr cre- crea creb crec cree creo cret crob croc croe croo cror crot crrt crtc ctab ctae ctba ctca ctec ctor ctot ctrc ctta eaba eaca eacc eaec eara earb eare earo eart eata eate ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecaa ecac ecao ecar ecat ecbc ecbe ecca eccb eccc ecce ecco ecct eco- ecot ecra ecrc ecrr ect- ecta ectc ecto eeca eeea eeee eeoc eera eerc eero eeta eetc eete eora eore eota eotc eoto erat erba erbb erbe erca ercc erce ereb erec erer eret erob eroc eroe eroo erra errc erre erro erta etat etbc etbr etcc etco etec etee eter etoe etra etre etro etta ette etto o-eo oaer oara oare oate obba obbo obea obec ober obet oboe obor obot obra obre obro ocab ocac ocat ocbc occa occc occt oce ocee ocet ocra ocre ocro ocrr oct- octa octe octo oec- oeca oecc oeec oera oere oeta ooaa ooba oobe oocr ooer oooo oora oore oort ootb orab orac orae orao orar orat orba orbb orbe orbo orca orce orco ore- orea oreb orec oreo orer oro- oroe oror orot orra orro orta ortc orte orto otac otar otea otee oter oto- otoe otoo otor otra otre otro otta otte otto raab raat raba rabb rabe rabo rac- raca racc race raco ract raec raer raob raoc rara rarb rare raro rata rate rato ratt rbbb rbbr rcac rcbc rcbo rccb rccc rcet rctc rea- reac reae reao rear reat reba rebb rebe rebo reca recc rece recr rect reeb reet reot rera rere rero rert reta rete reto retr rett roab roar roat rob- roba robb robe robo robt roca rocc roce roco roea roer roet roob roor root rora rorc rore roro rort rota rotc rote roto rotr rott rrat rrrr rtca rtcc rtce rtee taa- taar taat taba tabb tabc tabe tabo taca tacc tace taco tact taec taer taoa taor tara tarb tarc tare taro tarr tart tata tatb tate tato tatr tatt tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tctc teac tear teat teba tebo teca teco tecr tect teec teer teet teor ter- tera terc tere tero terr teta tete teto tetr tett toab toat toba tobe tobo tobt toca toce toco toea toee toer toet tooa toor toot tora torc tore toro torr tort tota totc tote toto totr tott traa trab trac trae trao trat trca trcc tre- trea trec tree treo tret troa troc troe troo trot trra trtc trte trtr ttab ttbb tteo tter ttoe tttt