c-- ccc ccd cce ccm cco ccp cdc cdd cde cdm cdo cdp ce- cec ced cee cem ceo cep cmc cmd cme cmm cmo cmp co- coc cod coe com coo cop cpc cpd cpe cpm cpo cpp dcc dcd dce dcm dco dcp ddc ddd dde ddm ddo ddp de- dec ded dee dem deo dep dmc dmd dme dmm dmo dmp doc dod doe dom doo dop dpc dpd dpe dpm dpo dpp ec- ecc ecd ece ecm eco ed- edc edd ede edm edo edp eec eed eee eem eeo eep em- emc emd eme emm emo emp eo- eoc eod eoe eom eoo eop ep- epc epd epe epm epo epp m-o mc- mcc mcd mce mcm mco mcp mdc mdd mde mdm mdo mdp mec med mee mem meo mep mmc mmd mme mmm mmo mmp moc mod moe mom moo mop mpc mpd mpe mpm mpo mpp oc- occ ocd ocm oco ocp odc odd ode odm odo odp oec oed oee oem oeo oep om- omc omd ome omm omo omp oo- ooc ood oom ooo oop op- opc opd ope opm opo opp p-p pcc pcd pce pcm pco pcp pdc pdd pde pdm pdo pdp pec ped pee pem peo pep pmc pmd pme pmm pmo pmp poc pod poe pom poo pop ppc ppd ppe ppm ppo ppp