c-- ccc ccd cce ccm cco cdc cdd cde cdm cdo cdq ce- cec ced cee cem ceo ceq cmc cmd cme cmm cmo cmq co- coc cod coe com coo coq cqc cqd cqm cqo dcc dcd dce dcm dco ddc ddd dde ddm ddo ddq de- dec ded dee dem deo deq dmc dmd dme dmm dmo doc dod doe dom doo doq dqe ec- ecc ecd ece ecm eco ecq ed- edc edd ede edm edo eec eed eee eem eeo em- emc emd eme emm emo eo- eoc eod eoe eom eoo eoq eqe eqq m-o mc- mcc mcd mce mcm mco mcq mdc mdd mde mdm mdo mdq mec med mee mem meo meq 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 oqo qcc qcd qcm qco qec qed qee qem qeo qmc qme qom qoo qqq