c-- ccc ccd ccn cco ccs ccx cdc cdd cdn cdo cds cdx cn- cnc cnd cnn cno cns cnx co- coc cod con coo cos cox csc csd csn cso css csx cxc cxo cxs cxx dcc dcd dcn dco dcs dcx ddc ddd ddn ddo dds ddx dnc dnd dnn dno dns doc dod don doo dos dox dsc dsd dsn dso dss dsx dxc dxd dxn dxo dxs dxx ncc ncd ncn nco ncs ncx ndc ndd ndn ndo nds nnc nnn nno nns no- noc nod non noo nos nox nsc nsd nsn nso nss nsx nxc nxd oc- occ ocd ocn oco ocs ocx odc odd odn odo ods on- onc ond onn ono ons onx oo- ooc ood oon ooo oos oox os- osc osd osn oso oss osx ox- oxc oxn oxo oxx scc scd scn sco scs scx sdc sdd sdn sdo sds snc snd snn sno sns soc sod son soo sos sox ss- ssc ssd ssn sso sss ssx sxc sxn sxs xcd xcx xdc xds xnc xno xns xoc xod xon xoo xos xox xsc xss xxo xxx