a-be aaaa aaab aaae aaar aaav aaba aabb aaea aaev aaoe aaoo aara aare aaro aaru aava abaa abab abae abar abau abb- abba abbb abbe abbo abbr abee aber aboa abob aboo abor abou abov abra abro abua abue abva aeer aer- aera aero aeva aoba aoeu aora aorb arab arae arar arau arba arbe area aree areo areu arev aroa arob aroe aroo aror arr- arra arre arro arrr arru arua arub arue arva arve arvo auaa aube auer aur- aura aure auro auve avab avao avar avea aveo aver aveu avor avou avra avre avro avur avva avvo baaa baar baba babb babe babo babr babu baer bar- bara barb bare baro barr baru bau- baur bava bave bavu bbau bbbb bbeb bear beau beav beba bebb bebe bebo beeb beer beo- beor bera bere bero berr beru beur bevo boab boar boba bobb bobe bobo bobu boea boee boeo boer boob booe boor bor- bora bore boro borr boru boua boue bour bova bove bovo brab brae brao brau brav brea breb bree breo brer brev broa brob broe broo bror brou brrr brue bruv buar buba bubb bube bubo bubu buea buer bueu bur- bura burb bure buro burr buru buve eaba eara earb eare earo eave ebba ebbo ebbr eber eboe eboo ebor ebro ebru ebur eeea eeee eera eero eeva eora eore erau erba erbb erbe ereb erer erev erob eroe eroo erra erre erro erua erub erur eruv erve euba euer eur- eura eure euro evae evar evea ever evoe evoo evra evre o-eo oaau oaer oara oare obba obbo obea ober oboe obor obra obre obro oera oere ooaa ooba oobe ooer oooo oora oore orab orae orao orar orav orba orbb orbe orbo orbu ore- orea oreb oreo orer oro- oroe oror orra orro orub orve orvr ouea ouer our- oura oure ouro ouu- ovar ovee over ovo- ovoo ovra ovre raab raba rabb rabe rabo rabu raer raob rara rarb rare raro raua raub raue rava rave rbbb rbbr rea- reae reao rear reau reba rebb rebe rebo rebu reeb reev reou rera rere rero reru reue reuu reva reve revo roab roar rob- roba robb robe robo robu roea roer roev roob roor rora rore roro roru roua roub roue rova rove rovo rrrr ruba rubb rube rubu ruer rura rure ruro ruru ruve ruvu rver uaru uaua ubar ubba ubbe ubbo uber ubra ueba uor- uore uovo urao urau urba urbe ure- urea uro- uroa uroo urra urre urur urva urve uuuu uv-a uv-b uvaa uvae uvea uver uvvu vaar vara vare varr varu vava vear veau veba veer veor ver- vera verb vere vero veur veve vevo voar voer voeu voor vor- vora vore voro voru voue vour vrav vrba vreo vurb vver vvob vvvv