a-be aaaa aaab aaae aaap aaav aaba aabb aabp aaea aaep aaev aaoe aaoo aapa aapo aaup aava abaa abab abae abap abau abb- abba abbb abbe abbo abee aboa abob aboo abou abov abpa abpp abua abue abva abvp aeap aeva aoba aoeu aopo apao apap apba apea apep apeu apev apo- apoe apoo apop apou appa appu apua apup auaa aube auve avab avao avea aveo aveu avou avpu avva avvo baaa baba babb babe babo babu bapa bape bapp bapu bau- bava bave bavu bbau bbbb bbeb beap beau beav beba bebb bebe bebo beeb beep beo- bepo bevo boab boba bobb bobe bobo bobu boea boee boeo boep boob booe boop bopa bope bopp boua boue boup bova bove bovo bpea bpoe buba bubb bube bubo bubu buea bueu bupa buve eaba eaop eapp eave eavp ebba ebbo eboe eboo ebpo eeea eeee eeva epaa epee eppa eppo eppp epub euba evae evap evea evoe evoo evop o-eo oaau obba obbo obea oboe oepa oevp ooaa ooba oobe oooo opap opep opo- oppa oppo opua ouea oupa oupe oupv ouu- ovee ovo- ovoo ovpp paap paba pabu paea paep papa papb pape papp paua paup pava pave pavo pbpa peab peap peau peba peep peev peou pepa pepe pepo poba pobo poea poop pop- popa pope popo popp poup povo ppap ppbv ppoa pppa pppo pppp pu-e puao pube pubu pueo pueu pupa pupe pupu pvpa uaua ubba ubbe ubbo ueba uovo upbe uppa uppe uppp uppu upup uuuu uv-a uv-b uvaa uvae uvea uvvu vapa vapb vape vava veau veba veep vepe veve vevo voeu voue vvob vvpb vvvv