a-be aaaa aaab aaae aaar aaba aabb aabt aaea aara aare aart aaru aata aatt abaa abab abae abar abat abau abb- abba abbb abbe abbr abbt abee aber abet abra abta abtu abua abue abut aeer aer- aera aeta aetr aett arab arae arar arat arau arba arbe area aree aret areu arr- arra arre arrr arrt arru arta arte artr arua arub arue arut at-t ataa atab atae atar atat atea atee ater atra atre atru atta atte attr attu atua atub atur auaa aube auer aur- aura aure aut- aute baaa baar baat baba babb babe babr babu baer bar- bara barb bare barr bart baru bata bate batt batu bau- baur bbau bbbb bbeb bbet bear beat beau beba bebb bebe beeb beer beet bera bere berr bert beru beta bete bett betu beur brab brae brat brau brea breb bree brer bret brrr brue brut btaa btrt bttb buar buat buba bubb bube bubu buea buer bueu bur- bura burb bure burr burt buru but- buta bute butt eaba eara earb eare eart eata eate ebba ebbr eber ebru ebur eeea eeee eera eeta eete eetu 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 euba euer eur- eura eure eurt raab raat raba rabb rabe rabu raer rara rarb rare rata rate ratt ratu raua raub raue raut rbbb rbbr rea- reae rear reat reau reba rebb rebe rebu reeb reet rera rere rert reru reta rete retr rett reue reut reuu rrat rrrr rtee 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 tbar tbrb tbta tear teat teba tebu teer teet ter- tera tere terr teru teta tete tetr tett tetu teut traa trab trae trat trau tre- trea tree tret treu trra trte trtr trub true trut truu ttab ttbb tter tttt tuae tuar tuat tuba tubb tube tubr tubu tuer tuet tura turb ture turr turt turu tuta tute tutt tutu uart uaru uata uatu uaua ubar ubba ubbe uber ubet ubra ueba urat urau urba urbe ure- urea uret urra urre urte urur urut utau uter uttu uuta uuuu