a-do aaaa aaab aaad aaap aaar aaba aabb aabd aabp aada aaoo aapa aapo aara aard aaro aarp abaa abab abad abap abar abb- abba abbb abbo abbr abda abdo aboa abob abod aboo abor abpa abpd abpp abpr abra abro adaa adab adad adao adap adar adba adda addd addo addr adob adod adoo ador adp- adra adro aoba aopo aora aorb apao apap apar apba apbr apda apdd apo- apod apoo apop apor appa appd appr apra apro arab arad arap arar arba arda ardo aroa arob arod aroo aror arpa arr- arra arro arrr baaa baad baar baba babb babo babr bada badb badd bado badr bapa bapp bar- bara barb bard baro barr bbad bbbb bbdd bbdo bbpr bd-r boab boad boar boba bobb bobo boda bodb bodo boob bood boop boor bopa bopp bor- bora bord boro borr bpda bprd brab brad brao brda brdo broa brob brod broo bror brrr d-bo daab daad daap daar daba dabb dabo dabp dada dado dapa dapp dara darb dard daro darp darr dbar dbpd dddd ddpo doab doap doar doba dobb dod- doda dodd dodo doob dood doop door dopa dopo dopp dopr dora dord doro dorp dorr dpaa dppa draa drab drad drap drar drba drda drob drod drop drra oara obad obba obbo obor obra obro odbo odda oddd odoo odop odor odra odrp ooaa ooba ooda oooo oora oord opap opar opo- opor oppa oppo opra orab orad orao orar orba orbb orbo orda ordo oro- oror orra orro paap paar paba pada padd pado papa papb papp papr par- para pard paro parp parr pbar pbpa pdpa pdpr poad poar poba pobo pod- poda podd podo pood poop poor pop- popa popo popp pora porb poro porr ppad ppap ppar ppoa ppod pppa pppd pppo pppp prad prao prar pro- proa prob prod proo prop prpd prrd raab raad raba rabb rabo rada radd rado radr raob raop rapa rapd rapp rara rarb raro rbbb rbbr rdap rdbp roab road roap roar rob- roba robb robo roda rodd rodo roob rood roop roor ropa ropo rora roro rpdp rpob rrad rrrr