b-u bbb bbc bbk bbn bbo bbr bbu bcb bcc bck bcn bco bcr bcu bkb bkc bkk bkn bko bkr bnb bnc bnk bnn bno bnr bnu bob boc bok bon boo bor bou brb brk brn bro brr bru bub buc buk bun buo bur buu c-- cbb cbc cbk cbn cbo cbr cbu ccb ccc cck ccn cco ccr ccu ckb ckc cko cn- cnb cnc cnn cno cnr cnu co- cob coc cok con coo cor cou crb crc crk crn cro crr cru cub cuc cuk cun cuo cur cuu kbb kbc kbk kbn kbo kbr kbu kcb kcc kck kcn kcr kcu kkb kkc kkk kkn kkr kku kn- knc knk knn kno knr knu kob koc kok kon koo kor kou krc krk krn kro krr kru kub kuc kuk kun kur kuu nbb nbc nbk nbn nbo nbr nbu ncb ncc nck ncn nco ncr ncu nkc nkk nkn nko nkr nku nnb nnc nnk nnn nno nnu no- nob noc nok non noo nor nou nrb nrc nrk nrn nro nrr nru nub nuc nuk nun nuo nur nuu ob- obb obc obk obn obo obr obu oc- ocb occ ock ocn oco ocr ocu okb okc okk oko okr oku on- onb onc onk onn ono onr onu oo- oob ooc ook oon ooo oor or- orb orc ork orn oro orr oru ou- ouc ouk oun ouo our rbb rbc rbk rbn rbo rbr rbu rcb rcc rcn rco rcr rcu rkb rkc rkk rko rku rnb rnc rnn rno rnr rnu rob roc rok ron roo ror rou rrb rrc rrk rrn rrr rru rub ruc ruk run ruo rur ruu ubb ubc ubk ubn ubo ubr ubu ucb ucc uck ucn uco ucr ucu ukb ukc ukk ukn ukr uku un- unb unc unk unn uno unr unu uob uoc uok uon uoo uor ur- urb urc urk urn uro urr uru uuc uun uur uuu

bbbb bbrc bcbc bccc bcnu bcor bcru bcuc bnoc bnor bnrr bobb bobo bobu bock boco bocu bokn boko boku bonc bonk bonn bono bonu boob booc book boon boor bor- bork born boro borr boru bouk boun bour brcb brkb brno brob broc brok bron broo bror brou brrr bruc brun bubb bubo bubu bucc buck buco bucu bukk buko buku bunb bunk bunn buno bunu buon bur- burb burk burn buro burr buru c-bo cbbc cbcc cbcn cbcr cbcu cbkn cbko cbkr cbrn ccbc ccbn cccb cccc cccu ccnb ccnc ccnr ccnu ccob ccoc ccrc ccuc ckbc ckck ckco cknb cknc ckob ckoc ckoo ckor ckrc cnbc cnco cnrc cnrr cobb cobo cobu cock coco cocu cok- coko con- conc conk conn cono coob cook coon cor- corb corc cork corn coro corr coub couk coun cour crbc crbu crcc crcr crkc crob croc crok cron croo cror crub cruk crun cub- cubb cucc cuck cucn cuk- cuno cuon curb curn curo curr kbbb kbbc kbbk kbbo kbbr kbbu kbcb kbck kbco kbcr kbcu kbkb kbkk kbko kbkr kbnn kbno kbnr kbnu kbob kboc kbok kbon kboo kbrb kbrc kbrk kbrn kbro kbru kbub kbuc kbuk kbun kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kckc kckk kckn kcko kckr kcnb kcno kcnr kcob kcon kcor kcou kcrc kcrn kcro kcrr kcru kcub kcuk kkbb kkbn kkbo kkbr kkcb kkck kkcn kkco kkcr kkkk kknb kknn kkno kknu kkob kkon kkoo kkor kkrb kkrc kkrk kkrn kkro kkrr kkuu knbb knbc knbn knbr knbu kncb knck kncn knco kncr kncu knkk knnb knnk knnr knob knoc knok knon knor knou knrb knrk knro knub knuk knur kobb kobc kobk kobn kobo kobr kobu kocb kock kocn kokb kokc kokk kokn koko kokr koku konc konk kono koob kooc kook koon kooo koor koou korb korc kork korn koro korr koru koub kour kouu krbb krbk krbr krcb krcc krcn krco krcu krkc krkk krkn krko krkr krku krnb krnk krnn krno krnu krob kroc krok kroo kror krrb krrc krrk krrn krro krrr kruc kruk krun krur kubb kubc kubo kubr kubu kucb kucc kuco kucr kukk kukn kuku kunc kunk kuno kunr kunu kuok kuon kuoo kurb kurk kuro kurr kuru kuub kuuk kuur kuuu nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu ncnc ncoc ncor ncrc ncuk nkok nkor nnnn nobc nobo nobu nock noco noko non- nonn nono nonu noo- noob nook noon nooo noor nor- norb norc nork norn noro norr noun nour nroc nron nrrc nubc nubk nuck nucu nuku nunc nunk nunn nuno nuoc nuon nurc nurn nurr nuru nuuk obbo obkb obok obon obor obro ocbc occc occn ocon ocro ocrr ocur okcu okko okno okok okon okor okro okun okur onc- onco onno onon onor onur oocr ooku oooo orbb orbo orbu orco orko ornc orno oro- orok oron oror orro orub oucc oun- our- ourn ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcnr rcon rnbr rnco rob- robb robo robu rocc rock roco rokk roko rokr roku ronc ronk rono roob rook roon roor rorc rork roro roru roub rouk roun rrrr rrun rubb rubu ruck rukk rukn ruku runc runk runn runo ruok rurc ruro ruru ruun ubbo uboc ubon ucbc ucon ucrc ukcc ukko uknc ukok ukon ukrc ukur uncc unco unkn unko unno unon unro uocc uor- uro- urok uroo uruk urun urur uuno uuoc uuuu

b-r-k bbook bcock bkorn bo-bo bobko boboc bobok bobr bocon bocor bokko bokok bokor bokun bonon bonou boock booco booko boonk boorn booru borbo borck borko borku born- borno bornu boro- borok boron boroo borou borro borun bouck bouko bourn brcko brobo brock bronc bronk bronn brook broon brouk broun brrrr bruck brunk brunn bruno bruun bubon bucco bucko bucku bucur bukk- buknu bukor bunco bunko bunuk bunun buono burck burcu burn- buron buroo burro burru buruc buruk burun c-cor ccccc cnnnn co-bo co-co cocc- cocco cocon cocur cokk- conck conco concr connu cono- conob conon