b-u bbb bbc bbk bbn bbr bbs bbu bcb bcc bck bcn bcr bcs bcu bkb bkc bkk bkn bkr bks bnb bnc bnk bnn bnr bns bnu brb brk brn brr brs bru bsb bsc bsk bsn bsr bss bsu bub buc buk bun bur bus buu c-- cbb cbc cbk cbn cbr cbs cbu ccb ccc cck ccn ccr ccs ccu ckb ckc cks cn- cnb cnc cnn cnr cns cnu crb crc crk crn crr crs cru csb csc csk csn csr css csu cub cuc cuk cun cur cus cuu kbb kbc kbk kbn kbr kbs kbu kcb kcc kck kcn kcr kcs kcu kkb kkc kkk kkn kkr kks kku kn- knc knk knn knr knu krc krk krn krr krs kru ksb ksc ksk ksn ksr kss ksu kub kuc kuk kun kur kus kuu nbb nbc nbk nbn nbr nbs nbu ncb ncc nck ncn ncr ncs ncu nkc nkk nkn nkr nks nku nnb nnc nnk nnn nns nnu nrb nrc nrk nrn nrr nrs nru nsb nsc nsk nsn nsr nss nsu nub nuc nuk nun nur nus nuu rbb rbc rbk rbn rbr rbs rbu rcb rcc rcn rcr rcs rcu rkb rkc rkk rks rku rnb rnc rnn rnr rns rnu rrb rrc rrk rrn rrr rrs rru rsb rsc rsk rsn rsr rss rsu rub ruc ruk run rur rus ruu sbb sbc sbk sbn sbr sbs sbu scb scc sck scn scr scs scu sk- skb skc skk skr sks sku snb snc snk snn snr sns snu sr- srb src srk srn srr srs ss- ssb ssc ssk ssn ssr sss ssu sub suc suk sun sur sus suu ubb ubc ubk ubn ubr ubs ubu ucb ucc uck ucn ucr ucs ucu ukb ukc ukk ukn ukr uku un- unb unc unk unn unr uns unu ur- urb urc urk urn urr urs uru usb usc usk usn usr uss usu uuc uun uur uus uuu

bbbb bbbs bbrc bcbc bcbs bccc bccs bcnu bcrs bcru bcsc bcsn bcss bcuc bnrr bnss brcb brkb brns brrr brrs brsb brsr bruc brun brus bscs bsns bssc bubb bubs bubu bucc buck bucs bucu bukk buku bunb bunk bunn buns bunu bur- burb burk burn burr burs buru busc busk buss busu buus cbbc cbbs cbcc cbcn cbcr cbcs cbcu cbkn cbkr cbrn cbsc cbsn cbus ccbc ccbn cccb cccc cccs cccu ccnb ccnc ccnr ccns ccnu ccrc ccrs ccsn ccss ccuc ccus ckbc ckck ckcs cknb cknc ckns ckrc cksb cnbc cnrc cnrr cnss crbc crbu crcc crcr crkc crns crss crub cruk crun crus cscb cscc cscr cscs csks csrc csrs cssr csur csus cub- cubb cubs cucc cuck cucn cuk- curb curn curr curs cusb cusk cuss cusu kbbb kbbc kbbk kbbr kbbs kbbu kbcb kbck kbcr kbcs kbcu kbkb kbkk kbkr kbnn kbnr kbnu kbrb kbrc kbrk kbrn kbru kbsb kbsk kbsn kbsr kbss kbsu kbub kbuc kbuk kbun kbur kbus kbuu kcbc kcbk kcbr kcbs kcbu kccb kccc kcck kccr kccu kckc kckk kckn kckr kcnb kcnr kcns kcrc kcrn kcrr kcrs kcru kcsb kcsc kcsn kcsr kcss kcsu kcub kcuk kkbb kkbn kkbr kkbs kkcb kkck kkcn kkcr kkcs kkkk kknb kknn kkns kknu kkrb kkrc kkrk kkrn kkrr kkrs kksn kksr kkss kksu kkus kkuu knbb knbc knbn knbr knbu kncb knck kncn kncr kncu knkk knnb knnk knnr knns knrb knrk knrs knsb knsc knsk knsn knsr knss knsu knub knuk knur knus krbb krbk krbr krcb krcc krcn krcs krcu krkc krkk krkn krkr krks krku krnb krnk krnn krnu krrb krrc krrk krrn krrr krrs krsc krsk krsn krsr krss krsu kruc kruk krun krur ksbc ksbn ksbr ksbs kscb ksck kscn kscr kscs kscu kskb kskk kskn kskr ksks ksku ksnb ksnc ksnk ksnn ksnr ksns ksrb ksrn ksrr ksrs kssn kssr ksss kssu ksub ksun ksuu kubb kubc kubr kubs kubu kucb kucc kucr kukk kukn kuks kuku kunc kunk kunr kuns kunu kurb kurk kurr kurs kuru kusb kusc kusn kusu kuub kuuk kuur kuuu nbbc nbcc nbcs ncbc ncbs nccc nccn nccr nccs nccu ncnc ncrc ncsc ncss ncuk nnnn nnss nrcs nrrc nrsc nscc nscs nskk nsnr nsrc nssb nssc nssr nsss nsub nubc nubk nubs nuck nucs nucu nuku nunc nunk nunn nuns nurc nurn nurr nurs nuru nuss nusu nuuk rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcnr rcsc rcss rkss rnbr rncs rrrr rrun rscc rscn rscs rsnn rsnr rubb rubs rubu ruck rukk rukn ruku runc runk runn runs rurc rurs ruru rusk russ rusu ruun sbbs sbcc sbcs sbrk sbus sccc sccs sck- scnr scr- scrc scrn scrs scsc scsn scsr scsu scub scun scur skn- skss skun skur sncc snns snrk snrs snub snur snus srbc srcc srnn srub ssbn ssbr sscc sscs ssns ssrc ssrs sssb sssc ssss sub- subb subs suc- succ suck sucr sucs suks suku sun- sunb sunk sunn suns sunu sur- surc surn surr surs suru sus- susk suss susu suus ucbc ucrc ucsb ucsc ucsu ukcc uknc ukrc uksc ukur uncc uncs unkn unks unns unrs uns- unsc unus urbs urns urss ursu uruk urun urur urus us-k usbc usbr usbs uscc uscs usnc usnr usnu ussb ussc ussr usss ussu usun usus uuuu

b-r-k bbsrc bbuss brrrr bruck brunk brunn bruns brusk bruss bruun bucks bucku bucsu bucur bukk- buknu bunks bunuk bunun bunus burbs burck burcu burks burn- burns burrs burru buruc buruk burun burus busks bussu busur busuu c-bus ccccc cnnnn cruck crunk cubub cucks cucuk curbs currs cusks knubs knuck knurr knurs krunk kruun kucuk kuksu kukur kunku kunsu kunur kurbu kurku kursk kuruc kuruk kurus kusur kuusk n-sub nbcsn nkubu nu-nu nubus nukus nunks nunns nunun nursu nuruk nurun nurus nusku nusus rubus rucks rukus runcu rusks s-bus sbuks sccbc scrub scrus scunk scurn scurr skcns skruk skunk skurn skurr skuru snbrn snub- snubs snuck snuss sssrb sssss subbu subss subuk suck- sucks sucr-