c-- ccc ccd ccm cco ccp cdc cdd cdm cdo cdp cmc cmd cmm cmo cmp co- coc cod com coo cop cpc cpd cpm cpo cpp dcc dcd dcm dco dcp ddc ddd ddm ddo ddp dmc dmd dmm dmo dmp doc dod dom doo dop dpc dpd dpm dpo dpp m-o mc- mcc mcd mcm mco mcp mdc mdd mdm mdo mdp mmc mmd mmm mmo mmp moc mod mom moo mop mpc mpd mpm mpo mpp oc- occ ocd ocm oco ocp odc odd odm odo odp om- omc omd omm omo omp oo- ooc ood oom ooo oop op- opc opd opm opo opp p-p pcc pcd pcm pco pcp pdc pdd pdm pdo pdp pmc pmd pmm pmo pmp poc pod pom poo pop ppc ppd ppm ppo ppp