c-- ccc ccd cce ccm cco cdc cdd cde cdm cdo ce- cec ced cee cem ceo cmc cmd cme cmm cmo co- coc cod coe com coo dcc dcd dce dcm dco ddc ddd dde ddm ddo de- dec ded dee dem deo dmc dmd dme dmm dmo doc dod doe dom doo ec- ecc ecd ece ecm eco ed- edc edd ede edm edo eec eed eee eem eeo em- emc emd eme emm emo eo- eoc eod eoe eom eoo m-o mc- mcc mcd mce mcm mco mdc mdd mde mdm mdo mec med mee mem meo mmc mmd mme mmm mmo moc mod moe mom moo oc- occ ocd ocm oco odc odd ode odm odo oec oed oee oem oeo om- omc omd ome omm omo oo- ooc ood oom ooo