a-do aaaa aaab aaad aaar aaba aabb aabd aada aadu aaoo aara aard aaro aaru abaa abab abad abar abau abb- abba abbb abbo abbr abda abdo abdu aboa abob abod aboo abor abou abra abro abua abud adaa adab adad adao adar adba adda addd addo addr addu adob adod adoo ador adra adro adua adub adur aoba aora aorb arab arad arar arau arba arda ardo ardu aroa arob arod aroo aror arr- arra arro arrr arru arua arub arud auaa audo aur- aura aurd auro baaa baad baar baba babb babo babr babu bada badb badd bado badr badu bar- bara barb bard baro barr baru bau- baud baur bbad bbau bbbb bbdd bbdo bd-r boab boad boar boba bobb bobo bobu boda bodb bodo bodu boob bood boor bor- bora bord boro borr boru boua boud bour brab brad brao brau brda brdo broa brob brod broo bror brou brrr brud buad buar buba bubb bubo bubu buda budb budd budo budu bur- bura burb burd buro burr buru d-bo daab daad daar daau daba dabb dabo dabu dada dado dadu daou dara darb dard daro darr daru daub daud daur dbar dddd ddub doab doar doba dobb dobu dod- doda dodd dodo doob dood door dora dord doro dorr doru doub doud dour draa drab drad drar drau drba drda drob drod drou drra drua drub druu duaa duab duad duar dub- duba dubb dubu duda dudd dudo dudu duo- dura duro duru duur oaau oara obad obba obbo obor obra obro odbo odda oddd odoo odor odou odra odur ooaa ooba ooda oooo oora oord orab orad orao orar orba orbb orbo orbu orda ordo ordu oro- oror orra orro orub ouad our- oura ouro ouu- raab raad raba rabb rabo rabu rada radd rado radr radu raob rara rarb raro raua raub raud rbbb rbbr roab road roar rob- roba robb robo robu roda rodd rodo roob rood roor rora roro roru roua roub roud rrad rrrr ruad ruba rubb rubu ruda rudd rudo rura rurd ruro ruru ruud uaru uaua ubar ubba ubbo ubod ubra ubud udaa udad udar udau udoo udra uor- urad urao urau urba urda urdu uro- uroa uroo urra urur uuuu