bbbb bbeb bcbc bccc bcec bcvo bebb bebe bebo beck beeb beek beke beko beo- beok bevo bobb bobe bobo boce bock boco boec boee boeo boke boko boob booc booe book bove bovo c-bo cbbc cbcc cbce cbec cbee cbko cbvb cbve ccbc cccb cccc cccv ccee ccob ccoc ccvo cec- cece ceco ceeb ceec ceke cevo ckbc ckbe ckck ckco ckcv ckob ckoc ckoo ckvo cobb cobe cobo coce cock coco cok- coke coko coob cook cove covo cvcc ebbc ebbo ebcc eboe eboo ecbc ecbe eccb eccc ecce ecco ecko eco- eeee eeke eeoc ekco ekeb ekek evoe evoo evvk kbbb kbbc kbbe kbbk kbbo kbcb kbce kbck kbco kbeb kbec kbee kbek kbeo kbev kbkb kbkk kbko kbkv kbob kboc kboe kbok kboo kbov kbvb kbvc kbvo kcbc kcbk kccb kccc kcck kccv kceb kcec kcee kceo kckc kckk kcko kckv kcob kcoe kcvk kcvo kcvv kebb kebc kebe keck keco keek kekb kekc keke keko keok keve kkbb kkbe kkbo kkcb kkck kkco kkkk kkob kkoo kkov kkvv kobb kobc kobe kobk kobo kocb kock kokb kokc koke kokk koko koob kooc kook kooo koov kovc kove kovk kovo kvbc kvcb kvcc kvce kvck kvco kvcv kvec kvob kvoc kvoe kvok kvoo kvov kvvv o-eo obbo obec obkb oboe obok ocbc occc oce ocee ocke oec- oecc oeec okko okok oobe oooo ovee ovo- ovoo vbcc vecc veck veke veve vevo voce voke vooc vovk vvob vvvv