c-- ccc ccd ccn cco ccs cdc cdd cdn cdo cds cn- cnc cnd cnn cno cns co- coc cod con coo cos csc csd csn cso css dcc dcd dcn dco dcs ddc ddd ddn ddo dds dnc dnd dnn dno dns doc dod don doo dos dsc dsd dsn dso dss ncc ncd ncn nco ncs ndc ndd ndn ndo nds nnc nnn nno nns no- noc nod non noo nos nsc nsd nsn nso nss oc- occ ocd ocn oco ocs odc odd odn odo ods on- onc ond onn ono ons oo- ooc ood oon ooo oos os- osc osd osn oso oss scc scd scn sco scs sdc sdd sdn sdo sds snc snd snn sno sns soc sod son soo sos ss- ssc ssd ssn sso sss