c-- ccc ccm cco ccp ccx cmc cmm cmo cmp cmx co- coc com coo cop cox cpc cpm cpo cpp cpx cxc cxo cxp cxx m-o mc- mcc mcm mco mcp mcx mmc mmm mmo mmp mmx moc mom moo mop mox mpc mpm mpo mpp mpx mxc mxp oc- occ ocm oco ocp ocx om- omc omm omo omp omx oo- ooc oom ooo oop oox op- opc opm opo opp opx ox- oxc oxo oxx p-p pcc pcm pco pcp pcx pmc pmm pmo pmp pmx poc pom poo pop pox ppc ppm ppo ppp ppx pxc pxm xcp xcx xmc xmm xmo xmp xmx xoc xom xoo xop xox xpc xpm xpo xpp xxo xxp xxx