c-- ccc ccd cce ccm cco ccv cdc cdd cde cdm cdo cdv ce- cec ced cee cem ceo cev cmc cmd cme cmm cmo cmv co- coc cod coe com coo cov cvc cvd cve cvm cvo cvv dcc dcd dce dcm dco dcv ddc ddd dde ddm ddo de- dec ded dee dem deo dev dmc dmd dme dmm dmo dmv doc dod doe dom doo dov dvc dvd dve dvm ec- ecc ecd ece ecm eco ecv ed- edc edd ede edm edo eec eed eee eem eeo eev em- emc emd eme emm emo emv eo- eoc eod eoe eom eoo evc evd eve evm evo evv m-o m-v mc- mcc mcd mce mcm mco mcv mdc mdd mde mdm mdo mdv mec med mee mem meo mev mmc mmd mme mmm mmo mmv moc mod moe mom moo mov mvc mvd mve mvm mvo mvv oc- occ ocd ocm oco ocv odc odd ode odm odo odv oec oed oee oem oeo om- omc omd ome omm omo omv oo- ooc ood oom ooo oov ov- ovc ovd ove ovo ovv v-e vcc vcd vce vcm vco vdc vdd vde vdm vdo vdv vec ved vee vem veo vm- vmc vmd vmm vmo voc vod voe vom voo vov vvc vvm vvo vvv