a-do aaaa aaab aaad aaar aaav aaba aabb aabd aada aadu aaoo aara aard aaro aaru aava abaa abab abad abar abau abb- abba abbb abbo abbr abda abdo abdu aboa abob abod aboo abor abou abov abra abro abua abud abva abvd adaa adab adad adao adar adba adda addd addo addr addu adob adod adoo ador adra adro adua adub adur advb aoba aora aorb arab arad arar arau arba arda ardo ardu aroa arob arod aroo aror arr- arra arro arrr arru arua arub arud arva arvo auaa audo aur- aura aurd auro avab avao avar avda avor avou avra avro avur avva avvo baaa baad baar baba babb babo babr babu bada badb badd bado badr badu bar- bara barb bard baro barr baru bau- baud baur bava bavu bbad bbau bbbb bbdd bbdo bd-r bdav boab boad boar boba bobb bobo bobu boda bodb bodo bodu boob bood boor bor- bora bord boro borr boru boua boud bour bova bovo brab brad brao brau brav brda brdo broa brob brod broo bror brou brrr brud bruv buad buar buba bubb bubo bubu buda budb budd budo budu bur- bura burb burd buro burr buru buvd bvdu d-bo daab daad daar daau daba dabb dabo dabu dada dado dadu daou dara darb dard daro darr daru daub daud daur dava 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 druv duaa duab duad duar dub- duba dubb dubu duda dudd dudo dudu duo- dura duro duru duur duva dvar dvda dvdr dvoa dvor dvra oaau oara obad obba obbo obor obra obro odbo odda oddd odoo odor odou odra odur odva ooaa ooba ooda oooo oora oord orab orad orao orar orav orba orbb orbo orbu orda ordo ordu oro- oror orra orro orub orvr ouad our- oura ouro ouu- ovar ovda ovo- ovod ovoo ovra raab raad raba rabb rabo rabu rada radd rado radr radu raob rara rarb raro raua raub raud rava rbbb rbbr roab road roar rob- roba robb robo robu roda rodd rodo roob rood roor rora roro roru roua roub roud rova rovo rrad rrrr ruad ruba rubb rubu ruda rudd rudo rura rurd ruro ruru ruud ruvu uaru uaua ubar ubba ubbo ubod ubra ubud udaa udad udar udau udoo udra uor- uovo urad urao urau urba urda urdu uro- uroa uroo urra urur urva uuuu uv-a uv-b uvaa uvda uvrd uvvu vaad vaar vada vado vadu vara vard varr varu vaud vava vdub voad voar voda vodo voor vor- vora vord voro voru voud vour vrav vrba vuda vudu vurb vvob vvvv