a-do aaaa aaab aaad aaap aaar aaav aaba aabb aabd aabp aada aaoo aapa aapo aara aard aaro aarp aava abaa abab abad abap abar abb- abba abbb abbo abbr abda abdo aboa abob abod aboo abor abov abpa abpd abpp abpr abra abro abva abvd abvp adaa adab adad adao adap adar adba adda addd addo addr adob adod adoo ador adp- adra adro advb 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 arva arvo avab avao avar avda avdp avor avra avro avva avvo baaa baad baar baba babb babo babr bada badb badd bado badr bapa bapp bar- bara barb bard baro barr bava bbad bbbb bbdd bbdo bbpr bd-r bdav boab boad boar boba bobb bobo boda bodb bodo boob bood boop boor bopa bopp bor- bora bord boro borr bova bovo bpda bprd brab brad brao brav 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 dava 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 dvar dvda dvdr dvoa dvor dvra dvrp oara obad obba obbo obor obra obro odbo odda oddd odoo odop odor odra odrp odva ooaa ooba ooda oooo oora oord opap opar opo- opor oppa oppo opra orab orad orao orar orav orba orbb orbo orda ordo oro- oror orra orro orvr ovar ovda ovo- ovod ovoo ovpp ovra paap paar paba pada padd pado papa papb papp papr par- para pard paro parp parr parv pava pavo pbar pbpa pdpa pdpr poad poar poba pobo pod- poda podd podo pood poop poor pop- popa popo popp pora porb poro porr povo ppad ppap ppar ppbv ppoa ppod pppa pppd pppo pppp prad prao prar pro- proa prob prod proo prop prov prpd prrd pvda pvpa raab raad raba rabb rabo rada radd rado radr raob raop rapa rapd rapp rara rarb raro rava rbbb rbbr rdap rdbp roab road roap roar rob- roba robb robo roda rodd rodo roob rood roop roor ropa ropo rora roro rova rovo rpdp rpob rrad rrrr vaad vaar vada vado vapa vapb vara vard varp varr vava vdbp voad voar voda vodo voor vor- vora vord voro vpro vrap vrav vrba vvob vvpb vvvv