b-u bbb bbc bbh bbk bbr bbs bbu bcb bcc bch bck bcr bcs bcu bhb bhc bhh bhk bhr bhs bhu bkb bkc bkk bkr bks brb brh brk brr brs bru bsb bsc bsh bsk bsr bss bsu bub buc buh buk bur bus buu c-- cbb cbc cbh cbk cbr cbs cbu ccb ccc cch cck ccr ccs ccu ch- chb chc chh chk chr chs chu ckb ckc ckh cks crb crc crh crk crr crs cru csb csc csh csk csr css csu cub cuc cuh cuk cur cus cuu hbb hbc hbh hbk hbr hbs hbu hcb hcc hch hck hcr hcs hhb hhc hhh hhk hhr hhs hhu hkb hkh hkk hkr hks hku hr- hrb hrc hrh hrk hrr hrs hru hsb hsc hsh hsk hsr hss hsu hub huc huh huk hur hus huu kbb kbc kbh kbk kbr kbs kbu kcb kcc kch kck kcr kcs kcu khh khk khr khs khu kkb kkc kkh kkk kkr kks kku krc krk krr krs kru ksb ksc ksh ksk ksr kss ksu kub kuc kuh kuk kur kus kuu rbb rbc rbh rbk rbr rbs rbu rcb rcc rch rcr rcs rcu rh- rhb rhc rhh rhr rhs rhu rkb rkc rkk rks rku rrb rrc rrh rrk rrr rrs rru rsb rsc rsh rsk rsr rss rsu rub ruc ruh ruk rur rus ruu sbb sbc sbh sbk sbr sbs sbu scb scc sch sck scr scs scu sh- shb shc shh shk shr shs shu sk- skb skc skh skk skr sks sku sr- srb src srh srk srr srs ss- ssb ssc ssh ssk ssr sss ssu sub suc suh suk sur sus suu ubb ubc ubh ubk ubr ubs ubu ucb ucc uch uck ucr ucs ucu uhb uhc uhh uhr uhs uhu ukb ukc ukk ukr uku ur- urb urc urk urr urs uru usb usc ush usk usr uss usu uuc uur uus uuu