c-- ccc ccd cce ccm ccv cdc cdd cde cdm cdv ce- cec ced cee cem cev cmc cmd cme cmm cmv cvc cvd cve cvm cvv dcc dcd dce dcm dcv ddc ddd dde ddm de- dec ded dee dem dev dmc dmd dme dmm dmv dvc dvd dve dvm ec- ecc ecd ece ecm ecv ed- edc edd ede edm eec eed eee eem eev em- emc emd eme emm emv evc evd eve evm evv m-v mc- mcc mcd mce mcm mcv mdc mdd mde mdm mdv mec med mee mem mev mmc mmd mme mmm mmv mvc mvd mve mvm mvv v-e vcc vcd vce vcm vdc vdd vde vdm vdv vec ved vee vem vm- vmc vmd vmm vvc vvm vvv