bbb bbc bbd bbo bbr bbs bby bcb bcc bcd bco bcr bcs bcy bdb bdc bdd bdo bdr bds bdy bob boc bod boo bor bos boy brb brd bro brr brs bry bsb bsc bsd bso bsr bss bsy by- byc byd byo byr bys c-- cbb cbc cbd cbo cbr cbs cby ccb ccc ccd cco ccr ccs cdb cdc cdd cdo cdr cds cdy co- cob coc cod coo cor cos coy crb crc crd cro crr crs cry csb csc csd cso csr css csy cyb cyc cyd cyo cyr cys dbb dbc dbd dbo dbr dbs dby dcb dcc dcd dco dcr dcs ddb ddc ddd ddo ddr dds ddy dob doc dod doo dor dos doy drb drc drd dro drr drs dry dsb dsc dsd dso dsr dss dsy dy- dyb dyc dyd dyo dyr dys dyy ob- obb obc obd obo obr obs oby oc- ocb occ ocd oco ocr ocs odb odc odd odo odr ods oo- oob ooc ood ooo oor oos or- orb orc ord oro orr ors ory os- osb osc osd oso osr oss oyd oyo oys rbb rbc rbd rbo rbr rbs rcb rcc rcd rco rcr rcs rdb rdc rdd rdo rdr rds rdy rob roc rod roo ror ros roy rrb rrc rrd rrr rrs rsb rsc rsd rso rsr rss ry- ryc ryd ryo ryr rys ryy sbb sbc sbd sbo sbr sbs sby scb scc scd sco scr scs sdb sdc sdd sdo sdr sds sdy sob soc sod soo sor sos soy sr- srb src srd sro srr srs sry ss- ssb ssc ssd sso ssr sss sy- syb syc syd syr sys ybc ybr ybs yby ycc ycd yco ycs ycy ydo yds ydy yob yoc yod yoo yor yos yoy yrc yro yrs ysb ysc yso ysr yss ysy yyb yyc yys yyy