bbbb bblb bcbc bccc bccl bcuc blcu blkb blob bloc blok bloo blou blub bobb bobo bobu bock boco bocu boko boku bolk boll bolo bolu boob booc book bool bouk boul bubb bubo bubu bucc buck buco bucu bukk buko buku bulb bulk bull bulu buol c-bo cbbc cbcc cbcl cbcu cbkl cbko cblb cblc cbol ccbc cccb cccc cccl cccu cclc ccob ccoc ccuc ckbc ckck ckcl ckco ckob ckoc ckoo clob clok cloo clou club cobb cobo cobu cock coco cocu cok- coko col- colb colk coll colo colu coob cook cool coub couk coul cub- cubb cucc cuck cuk- culb culc culk cull culo k-lo kbbb kbbc kbbk kbbl kbbo kbbu kbcb kbck kbcl kbco kbcu kbkb kbkk kbkl kbko kblb kbll kblo kblu kbob kboc kbok kboo kbub kbuc kbuk kbul kbuu kcbc kcbk kcbl kcbu kccb kccc kcck kccl kccu kckc kckk kckl kcko kclc kclk kcll kclu kcob kcol kcou kcub kcuk kcul kkbb kkbl kkbo kkcb kkck kkcl kkco kkkk kklb kklc kkll kklo kkob kkol kkoo kkuu klbb klbc klbl klbu klcb klcc klck klcl klkc klkk klkl klko kllb kllc kllk klob kloc klok klol kloo klou klub kluk kluu kobb kobc kobk kobo kobu kocb kock kokb kokc kokk koko koku kolb kolc kolk koll kolo kolu koob kooc kook kool kooo koou koub koul kouu kubb kubc kubo kubu kucb kucc kuco kukk kukl kuku kulb kull kulo kulu kuok kuol kuoo kuub kuuk kuul kuuu lbcc lcbc lccc llcc lllc llll lloc lloo lob- lobb lobo locc lock loco locu lokk loko loll lolo loob looc look lool louk loul louu luck luko lull lulu luuk obbo obkb oblu obok obol ocbc occc oclc ocul okcu okko oklo okok okol okul olbo olcc ollo ooku oolo oooo oucc oulk oulu ouu- ubbo ublo uboc ucbc ukcc ukko ukok ulbc ulcc ulco ullo ulo- uloc uluk ulul uocc uolc uulu uuoc uuuu