a-be aaaa aaab aaad aaae aaar aaba aabb aabd aada aade aadu aaea aara aard aare aaru abaa abab abad abae abar abau abb- abba abbb abbe abbr abda abdu abed abee aber abra abua abud abue adaa adab adad adae adar adba adda addd adde addr addu adea adeb adee ader adra adre adua adub adue adur aede aeer aer- aera aerd arab arad arae arar arau arba arbe arda arde ardu area ared aree areu arr- arra arre arrr arru arua arub arud arue auaa aube aude auer aur- aura aurd aure baaa baad baar baba babb babe babr babu bada badb badd bade badr badu baed baer bar- bara barb bard bare barr baru bau- baud baur bbad bbau bbbb bbdd bbeb bd-r bead bear beau beba bebb bebe beda bede bedu beeb beed beer bera berd bere berr beru beur brab brad brae brau brda brea breb bred bree brer brrr brud brue buad buar buba bubb bube bubu buda budb budd bude budu buea buer bueu bur- bura burb burd bure burr buru daab daad daae daar daau daba dabb dabu dada dade dadu daeb daer daeu dara darb dard dare darr daru daub daud daue daur dbar dddd ddre ddub dead deae dear deau deba debe debu deda dedd dede dedu deeb deed deer der- dera derb dere derr deua deue deur draa drab drad drar drau drba drda drea dred dree drra drua drub drue druu duaa duab duad duar dub- duba dubb dube dubu duda dudd dude dudu duer dura dure duru duur eaba eada eadb eadd eara earb eard eare ebba ebbr ebed eber ebru ebur edad edar edda edde ede- edea eder edra edru edur eede eedu eeea eeee eera erad erau erba erbb erbe erda erde ereb ered erer erra erre erua erub erur euba eude euer eur- eura eure raab raad raba rabb rabe rabu rada radd rade radr radu raed raer rara rarb rare raua raub raud raue rbbb rbbr rder rea- read reae rear reau reba rebb rebe rebu reda redd rede redr redu reeb reed rera rerd rere reru reue reuu rrad rred rrrr ruad ruba rubb rube rubu ruda rudd rude rued ruer rura rurd rure ruru ruud uaru uaua ubar ubba ubbe uber ubra ubud udaa udad udar udau udea uder udra ueba ueda urad urau urba urbe urda urde urdu ure- urea ured urra urre urur uuuu