a-be aaaa aaab aaae aaar aaav aaba aabb aabt aaea aaev aara aare aart aaru aata aatt aava abaa abab abae abar abat abau abb- abba abbb abbe abbr abbt abee aber abet abra abta abtu abua abue abut abva aeer aer- aera aeta aetr aett aeva arab arae arar arat arau arba arbe area aree aret areu arev arr- arra arre arrr arrt arru arta arte artr artv arua arub arue arut arva arve 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 auve avab avar avat avea aver aveu avra avre avur avva baaa baar baat baba babb babe babr babu baer bar- bara barb bare barr bart baru bata bate batt batu bau- baur bava bave bavu bbau bbbb bbeb bbet bear beat beau beav beba bebb bebe beeb beer beet bera bere berr bert beru beta bete bett betu betv beur brab brae brat brau brav brea breb bree brer bret brev brrr brue brut bruv btaa btrt bttb buar buat buba bubb bube bubu buea buer bueu bur- bura burb bure burr burt buru but- buta bute butt buve eaba eara earb eare eart eata eate eave ebba ebbr eber ebru ebur eeea eeee eera eeta eete eetu eeva erat erau erba erbb erbe ereb erer eret erev erra erre erta ertu erua erub erur eruv erve etat etbr etee eter etra etre etta ette ettu etua euba euer eur- eura eure eurt evae evar evat evea ever evet evra evre raab raat raba rabb rabe rabu raer rara rarb rare rata rate ratt ratu raua raub raue raut rava rave rbbb rbbr rea- reae rear reat reau reba rebb rebe rebu reeb reet reev rera rere rert reru reta rete retr rett reue reut reuu reva reve rrat rrrr rtee rtva rtve ruba rubb rube rubu ruer ruet rura rure ruru ruta rute rutt rutu ruve ruvu rver taa- taar taat taba tabb tabe tabu taer tara tarb tare tarr tart taru tata tatb tate tatr tatt tatu tatv taua taub taue taur taut tava tave tbar tbrb tbta tear teat teba tebu teer teet teev ter- tera tere terr teru teta tete tetr tett tetu teut teva traa trab trae trat trau trav tre- trea tree tret treu trev 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 tuva tver tvrr tvtv uart uaru uata uatu uatv uaua ubar ubba ubbe uber ubet ubra ueba urat urau urba urbe ure- urea uret urra urre urte urur urut urva urve utau uter uttu uuta uuuu uv-a uv-b uvaa uvae uvat uvea uver uvvu vaar vaat vara vare varr vart varu vata vate vatt vatu vaut vava vear veat veau veba veer veet ver- vera verb vere vert veta vete vetr veur veve vrav vrba vret vurb vurt vutv vver vvvv