a-ak a-be a-ok aaaa aaab aaae aaar aaav aaba aabb aaea aaev aaka aake aaoe aaoo aara aare aaro aava abaa abab abae abak abar abb- abba abbb abbe abbo abbr abee aber aboa abob abok aboo abor abov abra abro abva aeer aeka aer- aera aero aeva akaa akae akao akar akee aker akka akko akok akr- akra akre aoba aora aorb arab arae arak arar arba arbe area aree arek areo arev arka arke arko aroa arob aroe aroo aror arr- arra arre arrk arro arrr arva arve arvo avab avao avar avea aveo aver avor avra avre avro avva avvo baaa baak baar baba babb babe babo babr baek baer bak- baka bake bako bakr bar- bara barb bare bark baro barr bava bave bbbb bbeb beak bear beav beba bebb bebe bebo beeb beek beer beka beke beko beo- beok beor bera bere berk bero berr bevo boab boak boar boba bobb bobe bobo boea boee boeo boer boka boke boko boob booe book boor bor- bora bore bork boro borr bova bove bovo brab brae brak brao brav brea breb bree brek breo brer brev brka brkb broa brob broe brok broo bror brrr eaba eara earb eare earo eave ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eeka eeke eera eero eeva eka- ekab ekeb ekek eker ekka ekoa eoka eora eore erba erbb erbe ereb erer erev erke erob eroe eroo erra erre erro erve evae evar evea ever evoe evoo evra evre evvk kaaa kaab kaak kaar kaba kabb kabe kabo kabr kaeo kaer kaka kake kakk kako kaoa kaok kaor kara karb kare kark karo karr karv kava kavb kave kavo kavv kbaa kbab kbae kbak kbar kbba kbbb kbbe kbbk kbbo kbbr kbeb kbee kbek kbeo kber kbev kbkb kbkk kbko kbkr kbkv kboa kbob kboe kbok kboo kbov kbra kbrb kbre kbrk kbro kbrv kbva kbvb kbvo kbvr kea- keak kear keba kebb kebe kebr keek keer keka kekb keke keko keok ker- kera kerb kere kerk kero kerr kerv keva keve kkaa kkar kkba kkbb kkbe kkbo kkbr kkea kkkk kkoa kkob kkoo kkor kkov kkrb kkre kkrk kkro kkrr kkrv kkvr kkvv koab koae koak koar koba kobb kobe kobk kobo kobr koea koka kokb koke kokk koko kokr koob kook kooo koor koov kora korb kore kork koro korr korv kova kove kovk kovo kovr krab krae krak krar krav krba krbb krbe krbk krbr krea kreb kree krek kreo krev krka krke krkk krko krkr krkv kroa krob kroe krok kroo kror krov krrb krre krrk krro krrr krva krvb krve krvk krvo krvr krvv kvab kvak kvar kvbr kvea kver kvoa kvob kvoe kvok kvoo kvor kvov kvra kvre kvro kvrr kvrv kvvr kvvv o-eo oaer oake oara oare obak obba obbo obea ober obkb oboe obok obor obra obre obro oera oere okak oker okka okko okok okor okra okre okro ooaa ooak ooba oobe ooer oooo oora oore orab orae orak orao orar orav orba orbb orbe orbo ore- orea oreb orek oreo orer orka orke orko oro- oroe orok oror orra orro orve orvr ovar ovee over ovo- ovoo ovra ovre raab raak raba rabb rabe rabk rabo raer raka rake rakk raob raok rara rarb rare rark raro rava rave rbbb rbbr rea- reae reak reao rear reba rebb rebe rebk rebo reeb reek reev reka reke reko rera rere rero reva reve revo roab roak roar rob- roba robb robe robo roea roer roev roka roke rokk roko rokr roob rook roor rora rore rork roro rova rove rovo rrrr rver vaar vaka vake vara vare vark varr vava veak vear veba veer veka veke veor ver- vera verb vere verk vero veve vevo vkor voar voer voka voke voor vor- vora vore voro vovk vrak vrav vrba vreo vver vvob vvvv