c-- ccc ccm cco ccp ccr cmc cmm cmo cmp cmr co- coc com coo cop cor cpc cpm cpo cpp cpr crc crm cro crp crr m-o m-r mc- mcc mcm mco mcp mcr mmc mmm mmo mmp mmr moc mom moo mop mor mpc mpm mpo mpp mpr mrc mrm mro mrp mrr oc- occ ocm oco ocp ocr om- omc omm omo omp omr oo- ooc oom ooo oop oor op- opc opm opo opp opr or- orc orm oro orp orr p-p pcc pcm pco pcp pcr pmc pmm pmo pmp pmr poc pom poo pop por ppc ppm ppo ppp ppr prc prm pro prp prr rcc rcm rco rcp rcr rmc rmm rmo rmp rmr roc rom roo rop ror rpc rpm rpo rpp rpr rrc rrm rrp rrr