a-be a-fu aaaa aaab aaae aaaf aaar aaba aabb aabt aaea aafa aafb aaff aara aare aart aaru aata aatf aatt abaa abab abae abaf abar abat abau abb- abba abbb abbe abbr abbt abee aber abet abff abra abta abtu abua abue abuf abut aeaf aeer aer- aera aeta aetf aetr aett afaa afar afat afee afer afet affa afft afr- afra afre afru afta afte afua afue arab arae araf arar arat arau arba arbe area aree aref aret areu arfa arfb arff arft arfu arr- arra arre arrr arrt arru arta arte artr arua arub arue arut at-t ataa atab atae atar atat atea atee atef ater atfb atfe atra atre atru atta atte attr attu atua atub atur auaa aube auer aufe aur- aura aure aut- aute baaa baaf baar baat baba babb babe babr babu baer baff baft bar- bara barb bare barf barr bart baru bata bate batf batt batu bau- bauf baur bbau bbbb bbeb bbet beaf bear beat beau beba bebb bebe beeb beef beer beet befa befe beff beft bera bere berr bert beru beta bete bett betu beur bfta bftt brab brae braf brat brau brea breb bree bref brer bret brfu brrr brue brut btaa btaf btrt bttb buar buat buba bubb bube bubu buea buer bueu bufe buff bufr bur- bura burb bure burr burt buru but- buta bute butt eaaf eaba eafb eara earb eare eart eata eate ebba ebbr eber ebru ebur eeea eeee eefa eefe eera eeta eete eetu efab efbr efet effa eft- efta eftu efua eraf erat erau erba erbb erbe ereb erer eret erft erra erre erta ertu erua erub erur etat etbr etee eter etfa etfb etfe etra etre etta ette ettu etua euba euer eur- eura eure eurt faaa faba fabe fabu faeb fafa fafe faff fara farb fare farr fart faru fata fate fatf fatt faue faur faut fbar feaf fear feat feba feeb feer feet fefe feff fera ferb fere ferr fert feru feta fete fetr fett fetu ffar ffee ffff ffrr fftf frab frae frat frau frea free fret frta frub frue ftea fter ftub fuar fuat fubb fubu fuet fuff fufu fur- fura fure furr furt futa fute futu raab raaf raat raba rabb rabe rabu raef raer rafa rafe raff raft rara rarb rare rarf rata rate ratf ratt ratu raua raub raue rauf raut rbaf rbbb rbbr rea- reae reaf rear reat reau reba rebb rebe rebu reeb reef reet refe reff refr reft refu rera rere rert reru reta rete retr rett reue reuf reut reuu rfae rfef rrat rrrr rtbf rtee rtfb ruba rubb rube rubu ruer ruet rufa rufe ruff ruft rura rure ruru ruta rute rutt rutu taa- taaf taar taat taba tabb tabe tabu taer tafa tafe taff taft tara tarb tare tarf tarr tart taru tata tatb tate tatr tatt tatu taua taub taue taur taut tbaf tbar tbrb tbta tear teat teba tebu teef teer teet teff teft ter- tera tere terf terr teru teta tete tetr tett tetu teut tfae tfeb traa trab trae traf trat trau tre- trea tree tref tret treu trfr trra trte trtr trub true trut truu ttab ttbb tter ttfa ttff tttt tuae tuar tuat tuba tubb tube tubr tubu tuer tuet tufa tufe tuff tuft tufu tura turb ture turf turr turt turu tuta tute tutt tutu uafa uart uaru uata uatu uaua ubar ubba ubbe uber ubet ubra ubtf ueba uefa ufer uffa uffe ufra urat urau urba urbe ure- urea uret urfa urfe urff urft urra urre urte urur urut utau uter uttu uuta uutf uuuu