bbb bbc bbo bbs bbw bby bcb bcc bco bcs bcy bob boc boo bos bow boy bsb bsc bso bss bsw bsy bwb bwc bwo bws bwy by- byc byo bys c-- cbb cbc cbo cbs cbw cby ccb ccc cco ccs ccw co- cob coc coo cos cow coy csb csc cso css csw csy cw- cwb cwc cwo cws cyb cyc cyo cys cyw ob- obb obc obo obs obw oby oc- ocb occ oco ocs ocw oo- oob ooc ooo oos oow os- osb osc oso oss osw owb owc owo ows oww oyo oys sbb sbc sbo sbs sbw sby scb scc sco scs scw sob soc soo sos sow soy ss- ssb ssc sso sss ssw swb swc swo sws swy sy- syb syc sys wbb wbc wbo wbs wbw wcb wcc wco wcs wcw wob woc woo wos wow woy wsb wsc wso wss wsw wwc wwo www wy- wyc wyo wys ybc ybs yby ycc yco ycs ycw ycy yob yoc yoo yos yow yoy ysb ysc yso yss ysy ywc yyb yyc yys yyy