a-be aaaa aaab aaae aaar aaba aabb aabt aaea aaoe aaoo aara aare aaro aart aaru aata aatt abaa abab abae abar abat abau abb- abba abbb abbe abbo abbr abbt abee aber abet aboa abob aboo abor abot abou abra abro abta abtu abua abue abut aeer aer- aera aero aeta aeto aetr aett aoba aoeu aora aorb aort aout arab arae arar arat arau arba arbe area aree areo aret areu aroa arob aroe aroo aror arr- arra arre arro arrr arrt arru arta arte arto artr arua arub arue arut at-t ataa atab atae atar atat atea atee ateo ater atob atoe ator atot atra atre atro atru atta atte atto attr attu atua atub atur auaa aube auer aur- aura aure auro aut- aute auto baaa baar baat baba babb babe babo babr babu baer bar- bara barb bare baro barr bart baru bata bate bato batt batu bau- baur bbau bbbb bbeb bbet bear beat beau beba bebb bebe bebo beeb beer beet beo- beor beot bera bere bero berr bert beru beta bete beto bett betu beur boab boar boat boba bobb bobe bobo bobu boea boee boeo boer boet boob booe boor boot bor- bora bore boro borr bort boru bota botb bote boto bott boua boue bour bout brab brae brao brat brau brea breb bree breo brer bret broa brob broe broo bror brot brou brrr brue brut btaa btob btor btrt bttb buar buat buba bubb bube bubo bubu buea buer bueu bur- bura burb bure buro burr burt buru but- buta bute buto butt eaba eara earb eare earo eart eata eate ebba ebbo ebbr eber eboe eboo ebor ebro ebru ebur eeea eeee eera eero eeta eete eetu eora eore eota eoto erat erau erba erbb erbe ereb erer eret erob eroe eroo erra erre erro erta ertu erua erub erur etat etbr etee eter etoe etra etre etro etta ette etto ettu etua euba euer eur- eura eure euro eurt o-eo oaau oaer oara oare oate obba obbo obea ober obet oboe obor obot obra obre obro oera oere oeta ooaa ooba oobe ooer oooo oora oore oort ootb orab orae orao orar orat orba orbb orbe orbo orbu ore- orea oreb oreo orer oro- oroe oror orot orra orro orta orte orto orub otar otea otee oter oto- otoe otoo otor otra otre otro otta otte otto ottu otur ouat ouea ouer our- oura oure ouro ourt out- outa outb oute outo ouu- raab raat raba rabb rabe rabo rabu raer raob rara rarb rare raro rata rate rato ratt ratu raua raub raue raut rbbb rbbr rea- reae reao rear reat reau reba rebb rebe rebo rebu reeb reet reot reou rera rere rero rert reru reta rete reto retr rett reue reut reuu roab roar roat rob- roba robb robe robo robt robu roea roer roet roob roor root rora rore roro rort roru rota rote roto rotr rott roua roub roue rout rrat rrrr rtee ruba rubb rube rubu ruer ruet rura rure ruro ruru ruta rute ruto rutt rutu taa- taar taat taba tabb tabe tabo tabu taer taoa taor taou tara tarb tare taro tarr tart taru tata tatb tate tato tatr tatt tatu taua taub taue taur taut tbar tbrb tbta tear teat teba tebo tebu teer teet teor ter- tera tere tero terr teru teta tete teto tetr tett tetu teut toab toat toau toba tobe tobo tobt tobu toea toee toer toet tooa toor toot tora tore toro torr tort toru tota tote toto totr tott tour tout traa trab trae trao trat trau tre- trea tree treo tret treu troa troe troo trot trou trra trte trtr trub true trut truu ttab ttbb tteo tter ttoe tttt tuae tuao tuar tuat tuba tubb tube tubo tubr tubu tuer tuet tuor tura turb ture turo turr turt turu tuta tute tuto tutt tutu tuuo uart uaru uata uatu uaua ubar ubba ubbe ubbo uber ubet ubra ueba uor- uore urao urat urau urba urbe ure- urea uret uro- uroa uroo urra urre urte urur urut utau uter utor utto uttu uuta uuuu