a-do aaaa aaab aaad aaar aaav aaba aabb aabd aada aaoo aara aard aaro aava abaa abab abad abar abb- abba abbb abbo abbr abda abdo aboa abob abod aboo abor abov abra abro abva abvd adaa adab adad adao adar adba adda addd addo addr adob adod adoo ador adra adro advb aoba aora aorb arab arad arar arba arda ardo aroa arob arod aroo aror arr- arra arro arrr arva arvo avab avao avar avda avor avra avro avva avvo baaa baad baar baba babb babo babr bada badb badd bado badr bar- bara barb bard baro barr bava bbad bbbb bbdd bbdo bd-r bdav boab boad boar boba bobb bobo boda bodb bodo boob bood boor bor- bora bord boro borr bova bovo brab brad brao brav brda brdo broa brob brod broo bror brrr d-bo daab daad daar daba dabb dabo dada dado dara darb dard daro darr dava dbar dddd doab doar doba dobb dod- doda dodd dodo doob dood door dora dord doro dorr draa drab drad drar drba drda drob drod drra dvar dvda dvdr dvoa dvor dvra oara obad obba obbo obor obra obro odbo odda oddd odoo odor odra odva ooaa ooba ooda oooo oora oord orab orad orao orar orav orba orbb orbo orda ordo oro- oror orra orro orvr ovar ovda ovo- ovod ovoo ovra raab raad raba rabb rabo rada radd rado radr raob rara rarb raro rava rbbb rbbr roab road roar rob- roba robb robo roda rodd rodo roob rood roor rora roro rova rovo rrad rrrr vaad vaar vada vado vara vard varr vava voad voar voda vodo voor vor- vora vord voro vrav vrba vvob vvvv