aaaa aaab aaad aaar aaba aabb aabd aabt aada aadt aadu aara aard aart aaru aata aatt abaa abab abad abar abat abau abb- abba abbb abbr abbt abda abdu abra abta abtu abua abud abut adaa adab adad adar adat adba adda addd addr addu adra adta adua adub adur arab arad arar arat arau arba arda ardu arr- arra arrr arrt arru arta artr arua arub arud arut at-t ataa atab atad atar atat atdt atra atru atta attr attu atua atub atur auaa aur- aura aurd aut- baaa baad baar baat baba babb babr babu bada badb badd badr badu bar- bara barb bard barr bart baru bata batt batu bau- baud baur bbad bbau bbbb bbdd bd-r brab brad brat brau brda brdt brrr brud brut btaa btdt btrt bttb buad buar buat buba bubb bubu buda budb budd budu bur- bura burb burd burr burt buru but- buta butt daab daad daar daau daba dabb dabt dabu dada dadu dara darb dard darr dart daru data datr datt datu daub daud daur daut dbar dbtt dddd ddub draa drab drad drar drat drau drba drda drra drua drub drut druu dtaa duaa duab duad duar duat dub- duba dubb dubu duda dudd dudu dura durt duru duta duur duut raab raad raat raba rabb rabu rada radd radr radt radu rara rarb rata ratt ratu raua raub raud raut rbbb rbbr rrad rrat rrrr rtdt ruad ruba rubb rubu ruda rudd rura rurd ruru ruta rutt rutu ruud taa- taar taat taba tabb tabu tada tara tarb tard tarr tart taru tata tatb tatr tatt tatu taua taub taur taut tbar tbrb tbta tddb tdra traa trab trad trat trau trra trtr trub trud trut truu ttab ttbb tttt tuar tuat tuba tubb tubr tubu tudu tura turb turd turr turt turu tuta tutt tutu uart uaru uata uatu uaua ubar ubba ubra ubud udaa udad udar udau udra urad urat urau urba urda urdu urra urur urut utau uttu uuta uuuu