bbb bbc bbg bbk bbo bbr bbs bby bcb bcc bcg bck bco bcr bcs bcy bgb bgc bgg bgk bgo bgr bgs bkb bkc bkg bkk bko bkr bks bob boc bog bok boo bor bos boy brb brg brk bro brr brs bry bsb bsc bsg bsk bso bsr bss bsy by- byc byg byk byo byr bys c-- cbb cbc cbg cbk cbo cbr cbs cby ccb ccc ccg cck cco ccr ccs cgb cgc cgg cgo cgr cgs cgy ckb ckc cko cks cky co- cob coc cog cok coo cor cos coy crb crc crg crk cro crr crs cry csb csc csg csk cso csr css csy cyb cyc cyg cyk cyo cyr cys gbc gbg gbk gbo gbr gbs gby gcb gcc gcg gck gco gcr gcs ggb ggc ggg ggo ggr ggs gkb gko gks gob goc gog gok goo gor gos goy grb grc grg grk gro grr grs gry gsb gsc gsg gsk gso gsr gss gy- gyb gyo gyr gys kbb kbc kbk kbo kbr kbs kcb kcc kcg kck kcr kcs kgb kgc kgo kgs kgy kkb kkc kkk kkr kks kky kob koc kog kok koo kor kos koy krc krg krk kro krr krs kry ksb ksc ksg ksk kso ksr kss kyc kyo kyr kys ob- obb obc obg obk obo obr obs oby oc- ocb occ ocg ock oco ocr ocs ogc ogg ogo ogs ogy okb okc okg okk oko okr oks oo- oob ooc oog ook ooo oor oos or- orb orc org ork oro orr ors ory os- osb osc osg osk oso osr oss oyo oys rbb rbc rbg rbk rbo rbr rbs rcb rcc rcg rco rcr rcs rgb rgc rgg rgk rgo rgr rgs rkb rkc rkg rkk rko rks rky rob roc rog rok roo ror ros roy rrb rrc rrg rrk rrr rrs rsb rsc rsg rsk rso rsr rss ry- ryc ryg ryk ryo ryr rys ryy sbb sbc sbg sbk sbo sbr sbs sby scb scc scg sck sco scr scs sgb sgc sgg sgk sgo sgr sgs sk- skb skc skg skk sko skr sks sky sob soc sog sok soo sor sos soy sr- srb src srg srk sro srr srs sry ss- ssb ssc ssg ssk sso ssr sss sy- syb syc syg syk syr sys ybc ybg ybr ybs yby ycc yco ycs ycy ygc ygo ykk yob yoc yog yok yoo yor yos yoy yrc yrg yro yrs ysb ysc ysg ysk yso ysr yss ysy yyb yyc yyg yys yyy