bbb bbc bbd bbo bbs bby bcb bcc bcd bco bcs bcy bdb bdc bdd bdo bds bdy bob boc bod boo bos boy bsb bsc bsd bso bss bsy by- byc byd byo bys c-- cbb cbc cbd cbo cbs cby ccb ccc ccd cco ccs cdb cdc cdd cdo cds cdy co- cob coc cod coo cos coy csb csc csd cso css csy cyb cyc cyd cyo cys dbb dbc dbd dbo dbs dby dcb dcc dcd dco dcs ddb ddc ddd ddo dds ddy dob doc dod doo dos doy dsb dsc dsd dso dss dsy dy- dyb dyc dyd dyo dys dyy ob- obb obc obd obo obs oby oc- ocb occ ocd oco ocs odb odc odd odo ods oo- oob ooc ood ooo oos os- osb osc osd oso oss oyd oyo oys sbb sbc sbd sbo sbs sby scb scc scd sco scs sdb sdc sdd sdo sds sdy sob soc sod soo sos soy ss- ssb ssc ssd sso sss sy- syb syc syd sys ybc ybs yby ycc ycd yco ycs ycy ydo yds ydy yob yoc yod yoo yos yoy ysb ysc yso yss ysy yyb yyc yys yyy