bbbb bblb bcbc bccc bccl blkb blob bloc blok bloo bobb bobo bock boco boko bolk boll bolo boob booc book bool c-bo cbbc cbcc cbcl cbkl cbko cblb cblc cbol ccbc cccb cccc cccl cclc ccob ccoc ckbc ckck ckcl ckco ckob ckoc ckoo clob clok cloo cobb cobo cock coco cok- coko col- colb colk coll colo coob cook cool k-lo kbbb kbbc kbbk kbbl kbbo kbcb kbck kbcl kbco kbkb kbkk kbkl kbko kblb kbll kblo kbob kboc kbok kboo kcbc kcbk kcbl kccb kccc kcck kccl kckc kckk kckl kcko kclc kclk kcll kcob kcol kkbb kkbl kkbo kkcb kkck kkcl kkco kkkk kklb kklc kkll kklo kkob kkol kkoo klbb klbc klbl klcb klcc klck klcl klkc klkk klkl klko kllb kllc kllk klob kloc klok klol kloo kobb kobc kobk kobo kocb kock kokb kokc kokk koko kolb kolc kolk koll kolo koob kooc kook kool kooo lbcc lcbc lccc llcc lllc llll lloc lloo lob- lobb lobo locc lock loco lokk loko loll lolo loob looc look lool obbo obkb obok obol ocbc occc oclc okko oklo okok okol olbo olcc ollo oolo oooo