bbbb bbeb bbrc bcbc bccc bcec bcer bcor bcvo bebb bebe bebo beck beeb beek beer beke beko beo- beok beor berc bere berk bero berr bevo bobb bobe bobo boce bock boco boec boee boeo boer boke boko boob booc booe book boor bor- bore bork boro borr bove bovo brcb brce breb brec bree brek breo brer brev brkb brob broc broe brok broo bror brrr c-bo cbbc cbcc cbce cbcr cbec cbee cber cbko cbkr cbre cbvb cbve cbvr ccbc cccb cccc cccv ccee ccob ccoc ccrc ccre ccvo cec- cece ceco ceeb ceec ceke ceor cer- cerc cere cero cevo ckbc ckbe ckck ckco ckcv cker ckob ckoc ckoo ckor ckrc ckvo cobb cobe cobo coce cock coco cok- coke coko coob cook cor- corb corc core cork coro corr cove covo crbc crcc crce crcr cre- creb crec cree creo crkc crob croc croe crok croo cror cvcc cver cvrr ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecko eco- ecrc ecrr ecrv eeee eeke eeoc eerc eero ekco ekeb ekek eker eore erbb erbe ercc erce ereb erec erer erev erke erob eroc eroe eroo errc erre erro erve ever evoe evoo evre evvk kbbb kbbc kbbe kbbk kbbo kbbr kbcb kbce kbck kbco kbcr kbeb kbec kbee kbek kbeo kber kbev kbkb kbkk kbko kbkr kbkv kbob kboc kboe kbok kboo kbov kbrb kbrc kbre kbrk kbro kbrv kbvb kbvc kbvo kbvr kcbc kcbk kcbr kccb kccc kcck kccr kccv kceb kcec kcee kceo kckc kckk kcko kckr kckv kcob kcoe kcor kcrc kcro kcrr kcrv kcvk kcvo kcvr kcvv kebb kebc kebe kebr keck keco kecr keek keer kekb kekc keke keko keok ker- kerb kerc kere kerk kero kerr kerv keve kkbb kkbe kkbo kkbr kkcb kkck kkco kkcr kkkk kkob kkoo kkor kkov kkrb kkrc kkre kkrk kkro kkrr kkrv kkvr kkvv kobb kobc kobe kobk kobo kobr kocb kock kokb kokc koke kokk koko kokr koob kooc kook kooo koor koov korb korc kore kork koro korr korv kovc kove kovk kovo kovr krbb krbe krbk krbr krcb krcc krce krco kreb krec kree krek kreo krev krkc krke krkk krko krkr krkv krob kroc kroe krok kroo kror krov krrb krrc krre krrk krro krrr krvb krvc krve krvk krvo krvr krvv kvbc kvbr kvcb kvcc kvce kvck kvco kvcr kvcv kvec kver kvob kvoc kvoe kvok kvoo kvor kvov kvrc kvre kvro kvrr kvrv kvvr kvvv o-eo obbo obec ober obkb oboe obok obor obre obro ocbc occc oce ocee ocke ocre ocro ocrr oec- oecc oeec oere oker okko okok okor okre okro oobe oocr ooer oooo oore orbb orbe orbo orce orco ore- oreb orec orek oreo orer orke orko oro- oroe orok oror orro orve orvr ovee over ovo- ovoo ovre rbbb rbbr rcbc rcbo rccb rccc rcvr rebb rebe rebk rebo recc rece reck recr reeb reek reev reke reko rere rero reve revo rob- robb robe robo rocc roce rock roco roer roev roke rokk roko rokr roob rook roor rorc rore rork roro rove rovo rrrr rv-c rver vbcc vecc veck veer veke veor ver- verb vere verk vero veve vevo vkor voce voer voke vooc voor vor- vore voro vovk vreo vroc vver vvob vvvv