a-be aaaa aaab aaae aaar aaba aabb aabt aaea aara aare aart aaru aata aatt abaa abab abae abar abat abau abax abb- abba abbb abbe abbr abbt abee aber abet abra abta abtu abua abue abut aeer aer- aera aeta aetr aett aetx arab arae arar arat arau arax arba arbe area aree aret areu arex arr- arra arre arrr arrt arru arta arte artr artx arua arub arue arut at-t at-x ataa atab atae atar atat atax atea atee ater atex atra atre atru atrx atta atte attr attu atua atub atur auaa aube auer aur- aura aure aut- aute auxa axar axat axer ba-x baaa baar baat baba babb babe babr babu baer bar- bara barb bare barr bart baru barx bata bate batt batu bau- baur baux baxt bbau bbbb bbeb bbet bear beat beau beba bebb bebe beeb beer beet bera bere berr bert beru beta bete bett betu beur beux brab brae brat brau brax brea breb bree brer bret brex brrr brue brut brux btaa btex btrt bttb buar buat buba bubb bube bubu buea buer bueu bur- bura burb bure burr burt buru but- buta bute butt buxa eaba eara earb eare eart eata eate eaux ebba ebbr eber ebru ebur eeea eeee eera eeta eete eetu eext er-x erat erau erba erbb erbe ereb erer eret erra erre erta ertu erua erub erur etat etbr etee eter etra etre etta ette ettu etua etux euba euer eur- eura eure eurt exa- exer exrx exta exte extr raab raat raba rabb rabe rabu raer rara rarb rare rata rate ratt ratu raua raub raue raut raxa rbbb rbbr rea- reae rear reat reau reba rebb rebe rebu reeb reet rera rere rert reru reta rete retr rett reue reut reuu reux rexx rrat rrrr rtee rtex ruba rubb rube rubu ruer ruet rura rure ruru ruta rute rutt rutu taa- taar taat taba tabb tabe tabu taer tara tarb tare tarr tart taru tata tatb tate tatr tatt tatu taua taub taue taur taut tax- taxa taxe taxt tbar tbrb tbta tear teat teba tebu teer teet ter- tera tere terr teru teta tete tetr tett tetu tetx teut texa text traa trab trae trat trau trax tre- trea tree tret treu trex trra trte trtr trub true trut truu trux ttab ttbb tter tttt tuae tuar tuat tuba tubb tube tubr tubu tuer tuet tura turb ture turr turt turu tuta tute tutt tutu txaa txtr uart uaru uata uatu uaua ubar ubba ubbe uber ubet ubra ueba uext urat urau urba urbe ure- urea uret urex urra urre urte urur urut utau uter uttu uuta uuuu uxue xaar xara xare xate xbar xbee xbra xeer xer- xera xert xexe xtar xtea xtra xura xuxa xuxu xxxx