a-do aaaa aaab aaad aaar aaba aabb aabd aada aaoo aara aard aaro abaa abab abad abar abb- abba abbb abbo abbr abda abdo aboa abob abod aboo abor abra abro adaa adab adad adao adar adba adda addd addo addr adob adod adoo ador adra adro aoba aora aorb arab arad arar arba arda ardo aroa arob arod aroo aror arr- arra arro arrr baaa baad baar baba babb babo babr bada badb badd bado badr bar- bara barb bard baro barr bbad bbbb bbdd bbdo bd-r boab boad boar boba bobb bobo boda bodb bodo boob bood boor bor- bora bord boro borr brab brad brao brda brdo broa brob brod broo bror brrr d-bo daab daad daar daba dabb dabo dada dado dara darb dard daro darr 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 oara obad obba obbo obor obra obro odbo odda oddd odoo odor odra ooaa ooba ooda oooo oora oord orab orad orao orar orba orbb orbo orda ordo oro- oror orra orro raab raad raba rabb rabo rada radd rado radr raob rara rarb raro rbbb rbbr roab road roar rob- roba robb robo roda rodd rodo roob rood roor rora roro rrad rrrr