bbb bbc bbm bbo bbs bbx bcb bcc bcm bco bcs bcx bmb bmc bmm bmo bms bmx bob boc bom boo bos box bsb bsc bsm bso bss bsx bxb bxm bxo bxx c-- cbb cbc cbm cbo cbs cbx ccb ccc ccm cco ccs ccx cmb cmc cmm cmo cms cmx co- cob coc com coo cos cox csb csc csm cso css csx cxc cxo cxs cxx m-o mbb mbc mbm mbo mbs mbx mc- mcb mcc mcm mco mcs mcx mmb mmc mmm mmo mms mmx mob moc mom moo mos mox msb msc msm mso mss msx mxc mxs ob- obb obc obm obo obs obx oc- ocb occ ocm oco ocs ocx om- omb omc omm omo oms omx oo- oob ooc oom ooo oos oox os- osb osc osm oso oss osx ox- oxb oxc oxo oxx sbb sbc sbm sbo sbs sbx scb scc scm sco scs scx smb smc smm smo sms smx sob soc som soo sos sox ss- ssb ssc ssm sso sss ssx sxc sxm sxs xbc xbx xcb xcx xmc xmm xmo xms xmx xoc xom xoo xos xox xsb xsc xsm xss xxo xxx