b-u bbb bbc bbk bbo bbr bbu bcb bcc bck bco bcr bcu bkb bkc bkk bko bkr bob boc bok boo bor bou brb brk bro brr bru bub buc buk buo bur buu c-- cbb cbc cbk cbo cbr cbu ccb ccc cck cco ccr ccu ckb ckc cko co- cob coc cok coo cor cou crb crc crk cro crr cru cub cuc cuk cuo cur cuu kbb kbc kbk kbo kbr kbu kcb kcc kck kcr kcu kkb kkc kkk kkr kku kob koc kok koo kor kou krc krk kro krr kru kub kuc kuk kur kuu ob- obb obc obk obo obr obu oc- ocb occ ock oco ocr ocu okb okc okk oko okr oku oo- oob ooc ook ooo oor or- orb orc ork oro orr oru ou- ouc ouk ouo our rbb rbc rbk rbo rbr rbu rcb rcc rco rcr rcu rkb rkc rkk rko rku rob roc rok roo ror rou rrb rrc rrk rrr rru rub ruc ruk ruo rur ruu ubb ubc ubk ubo ubr ubu ucb ucc uck uco ucr ucu ukb ukc ukk ukr uku uob uoc uok uoo uor ur- urb urc urk uro urr uru uuc uur uuu

bbbb bbrc bcbc bccc bcor bcru bcuc bobb bobo bobu bock boco bocu boko boku boob booc book boor bor- bork boro borr boru bouk bour brcb brkb brob broc brok broo bror brou brrr bruc bubb bubo bubu bucc buck buco bucu bukk buko buku bur- burb burk buro burr buru c-bo cbbc cbcc cbcr cbcu cbko cbkr ccbc cccb cccc cccu ccob ccoc ccrc ccuc ckbc ckck ckco ckob ckoc ckoo ckor ckrc cobb cobo cobu cock coco cocu cok- coko coob cook cor- corb corc cork coro corr coub couk cour crbc crbu crcc crcr crkc crob croc crok croo cror crub cruk cub- cubb cucc cuck cuk- curb curo curr kbbb kbbc kbbk kbbo kbbr kbbu kbcb kbck kbco kbcr kbcu kbkb kbkk kbko kbkr kbob kboc kbok kboo kbrb kbrc kbrk kbro kbru kbub kbuc kbuk kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kckc kckk kcko kckr kcob kcor kcou kcrc kcro kcrr kcru kcub kcuk kkbb kkbo kkbr kkcb kkck kkco kkcr kkkk kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kkuu kobb kobc kobk kobo kobr kobu kocb kock kokb kokc kokk koko kokr koku koob kooc kook kooo koor koou korb korc kork koro korr koru koub kour kouu krbb krbk krbr krcb krcc krco krcu krkc krkk krko krkr krku krob kroc krok kroo kror krrb krrc krrk krro krrr kruc kruk krur kubb kubc kubo kubr kubu kucb kucc kuco kucr kukk kuku kuok kuoo kurb kurk kuro kurr kuru kuub kuuk kuur kuuu obbo obkb obok obor obro ocbc occc ocro ocrr ocur okcu okko okok okor okro okur oocr ooku oooo orbb orbo orbu orco orko oro- orok oror orro orub oucc our- ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rob- robb robo robu rocc rock roco rokk roko rokr roku roob rook roor rorc rork roro roru roub rouk rrrr rubb rubu ruck rukk ruku ruok rurc ruro ruru ubbo uboc ucbc ucrc ukcc ukko ukok ukrc ukur uocc uor- uro- urok uroo uruk urur uuoc uuuu

b-r-k bbook bcock bo-bo bobko boboc bobok bobr bocor bokko bokok bokor boock booco booko booru borbo borck borko borku boro- borok boroo borou borro bouck bouko brcko brobo brock brook brouk brrrr bruck bucco bucko bucku bucur bukk- bukor burck burcu buroo burro burru buruc buruk c-cor ccccc co-bo co-co cocc- cocco cocur cokk- corbo corbu coro- couco courb couru crock croco crook crouk cruck cruor cubo- cubub cucuk cukor cuoco curro k-rob ko-ko kobru kobuk kokko kokor kokou kokur kooru korbo korck korku koror korro koruk krock kubok kucuk kukko kukok kukur kurbu kurku kuruc kuruk o-r-b obock oboro obrok occur ockro ocr-b okkur okobo okoc okoro okubo okuku okuru ooooo orobo oroco oruku oruro ouoro r-co- ro-ro robbo robo- robor robur rocco rocko rocor rocou rokkk rorbu rouko rubor ubobo ukobu uroob urour urubu urucu uuork uuuuu

bbbbbb bobrok boccob bocock bokoro booboo borbor borkou boroko bororo boubou boukou bourou brocco brocor brokkr broock brouck brubru bububu bucco- bukkur bukuru burbur buruku cobbob cocco- cococo coocoo cookoo corour coruco coruro courbu courr- crocco cruro- cuckoo cucurb curour curror cururo k-rock koboko kokoku kokoro kokubo kookoo korkor kororo korubo koruru koubou koukou kouoro kourou kukoc kurkcu kuroko kururu occour ookroo oooooo orrock orrour rococo rokkor rokuko rokuro roucou rubro- ruocco

bbbbbbb bok-bok boo-boo boobook boocock bourock bourrou brokour cooccur corrour cou-cou cubukcu currock kobroor kokocko kokorou kor-kor korkoro korucuk kucbork oroboro rococco rubbour ububboo

bbbbbbbb bo-bo-bo broubrou buckbuck buruburu co-occur cocoroco cookbook corocoro cucurucu curucucu kobukuro kokborok kukukuku kukuruku kuruburu kurukuru ockbrook rokkurro rubrouck ubbubboo

borborbor couroucou koukourou rockbrook roocoocoo

kouroukoro kukkurukuu rococococo

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