c-- ccc ccm ccn cco ccs cmc cmm cmn cmo cms cn- cnc cnm cnn cno cns co- coc com con coo cos csc csm csn cso css m-o mc- mcc mcm mcn mco mcs mmc mmm mmn mmo mms mnc mnm mnn mno mns moc mom mon moo mos msc msm msn mso mss ncc ncm ncn nco ncs nmc nmm nmn nmo nms nnc nnm nnn nno nns no- noc nom non noo nos nsc nsm nsn nso nss oc- occ ocm ocn oco ocs om- omc omm omn omo oms on- onc onn ono ons oo- ooc oom oon ooo oos os- osc osm osn oso oss scc scm scn sco scs smc smm smn smo sms snc snm snn sno sns soc som son soo sos ss- ssc ssm ssn sso sss