bbbb bbeb bcbc bccc bcec bebb bebe bebo beck beeb beek beke beko beo- beok bobb bobe bobo boce bock boco boec boee boeo boke boko boob booc booe book c-bo cbbc cbcc cbce cbec cbee cbko ccbc cccb cccc ccee ccob ccoc cec- cece ceco ceeb ceec ceke ckbc ckbe ckck ckco ckob ckoc ckoo cobb cobe cobo coce cock coco cok- coke coko coob cook ebbc ebbo ebcc eboe eboo ecbc ecbe eccb eccc ecce ecco ecko eco- eeee eeke eeoc ekco ekeb ekek kbbb kbbc kbbe kbbk kbbo kbcb kbce kbck kbco kbeb kbec kbee kbek kbeo kbkb kbkk kbko kbob kboc kboe kbok kboo kcbc kcbk kccb kccc kcck kceb kcec kcee kceo kckc kckk kcko kcob kcoe kebb kebc kebe keck keco keek kekb kekc keke keko keok kkbb kkbe kkbo kkcb kkck kkco kkkk kkob kkoo kobb kobc kobe kobk kobo kocb kock kokb kokc koke kokk koko koob kooc kook kooo o-eo obbo obec obkb oboe obok ocbc occc oce ocee ocke oec- oecc oeec okko okok oobe oooo