a-be aaaa aaab aaae aaap aaar aaav aaba aabb aabp aaea aaep aaev aaoe aaoo aapa aapo aara aare aaro aarp aava abaa abab abae abap abar abb- abba abbb abbe abbo abbr abee aber aboa abob aboo abor abov abpa abpp abpr abra abro abva abvp aeap aeer aer- aera aero aeva aoba aopo aora aorb apao apap apar apba apbr apea apep aper apev apo- apoe apoo apop apor appa appr apra apre apro arab arae arap arar arba arbe area aree areo arep arev aroa arob aroe aroo aror arpa arpe arr- arra arre arro arrr arva arve arvo avab avao avar avea aveo aver avor avra avre avro avva avvo baaa baar baba babb babe babo babr baer bapa bape bapp bar- bara barb bare baro barr bava bave bbbb bbeb bbpr beap bear beav beba bebb bebe bebo beeb beep beer beo- beor bepo bera bere bero berr bevo boab boar boba bobb bobe bobo boea boee boeo boep boer boob booe boop boor bopa bope bopp bor- bora bore boro borr bova bove bovo bpea bpoe brab brae brao brav brea breb bree breo brep brer brev broa brob broe broo bror brrr eaba eaop eapp eara earb eare earo earp eave eavp ebba ebbo ebbr eber eboe eboo ebor ebpo ebro eeea eeee eera eero eeva eora eore epaa epee eper epor eppa eppo eppp epra eprb epro eprp erap erba erbb erbe ereb erer erev erob eroe eroo erpa erpe erra erre erro erve evae evap evar evea ever evoe evoo evop evra evre o-eo oaer oara oare obba obbo obea ober oboe obor obra obre obro oepa oera oere oevp ooaa ooba oobe ooer oooo oora oore opap opar opep oper opo- opor oppa oppo opra orab orae orao orar orav orba orbb orbe orbo ore- orea oreb oreo orer oro- oroe oror orpe orra orro orve orvr ovar ovee over ovo- ovoo ovpp ovra ovre paap paar paba paea paep paer papa papb pape papp papr par- para pare paro parp parr parv pava pave pavo pbar pbpa peab peap pear peba peep peer peev peor pepa pepe pepo per- pera pere pero perp perr perv poar poba pobo poea poer poop poor pop- popa pope popo popp pora porb pore poro porr povo ppap ppar ppbv pper ppoa pppa pppo pppp prae prao prar pre- preb pree prep prev pro- proa prob proe proo prop prov pvpa raab raba rabb rabe rabo raep raer raob raop rapa rape rapp rara rarb rare raro rava rave rbbb rbbr rea- reae reao reap rear reba rebb rebe rebo reeb reep reev reop repe repo repp repr rera rere rero reva reve revo revp roab roap roar rob- roba robb robe robo roea roer roev roob roop roor ropa rope ropo rora rore roro rova rove rovo rpob rpoe rrrr rver vaar vapa vapb vape vara vare varp varr vava vear veba veep veer veor vepe vepr ver- vera verb vere vero veve vevo voar voer voor vor- vora vore voro vpro vrap vrav vrba vreo vver vvob vvpb vvvv