bbbb bblb bbrc bcbc bccc bccl bcor blkb blob bloc blok bloo blrc bobb bobo bock boco boko bolk boll bolo boob booc book bool boor bor- bork boro borr brcb brkb brob broc brok brol broo bror brrr c-bo cbbc cbcc cbcl cbcr cbkl cbko cbkr cblb cblc cbol cbrl ccbc cccb cccc cccl cclc ccob ccoc ccrc ccrl ckbc ckck ckcl ckco ckob ckoc ckoo ckor ckrc clob clok cloo clor clro cobb cobo cock coco cok- coko col- colb colk coll colo coob cook cool cor- corb corc cork corl coro corr crbc crcc crcr crkc crkl crob croc crok crol croo cror k-lo kbbb kbbc kbbk kbbl kbbo kbbr kbcb kbck kbcl kbco kbcr kbkb kbkk kbkl kbko kbkr kblb kbll kblo kblr kbob kboc kbok kboo kbrb kbrc kbrk kbrl kbro kcbc kcbk kcbl kcbr kccb kccc kcck kccl kccr kckc kckk kckl kcko kckr kclc kclk kcll kclr kcob kcol kcor kcrc kcro kcrr kkbb kkbl kkbo kkbr kkcb kkck kkcl kkco kkcr kkkk kklb kklc kkll kklo kkob kkol kkoo kkor kkrb kkrc kkrk kkrl kkro kkrr klbb klbc klbl klcb klcc klck klcl klcr klkc klkk klkl klko klkr kllb kllc kllk klob kloc klok klol kloo klor klrc klrk klrr kobb kobc kobk kobo kobr kocb kock kokb kokc kokk koko kokr kolb kolc kolk koll kolo kolr koob kooc kook kool kooo koor korb korc kork korl koro korr krbb krbk krbl krbr krcb krcc krcl krco krkc krkk krko krkr krlc krob kroc krok krol kroo kror krrb krrc krrk krrl krro krrr lbcc lblr lcbc lccc lcor lcrl llcc lllc llll lloc lloo lob- lobb lobo locc lock loco lokk loko loll lolo loob looc look lool loor lork loro lroc lrrc lrrr obbo obkb obok obol obor obro ocbc occc oclc ocrl ocro ocrr okko oklo okok okol okor okro olbo olcc ollo olor oocr oolo oooo orbb orbo orco orko orlo oro- orok oror orro rbbb rbbr rbcl rcbc rcbo rccb rccc rob- robb robo rocc rock roco rokk roko rokr rolk roll rolo roob rook rool roor rorc rork roro rrrr