c-- ccc ccd cce ccm cco ccx cdc cdd cde cdm cdo cdx ce- cec ced cee cem ceo cex cmc cmd cme cmm cmo cmx co- coc cod coe com coo cox cxc cxo cxx dcc dcd dce dcm dco dcx ddc ddd dde ddm ddo ddx de- dec ded dee dem deo dex dmc dmd dme dmm dmo dmx doc dod doe dom doo dox dxc dxd dxo dxx ec- ecc ecd ece ecm eco ecx ed- edc edd ede edm edo edx eec eed eee eem eeo eex em- emc emd eme emm emo emx eo- eoc eod eoe eom eoo ex- exc exd exe exo exx m-o mc- mcc mcd mce mcm mco mcx mdc mdd mde mdm mdo mdx mec med mee mem meo mex mmc mmd mme mmm mmo mmx moc mod moe mom moo mox mxc mxd oc- occ ocd ocm oco ocx odc odd ode odm odo oec oed oee oem oeo oex om- omc omd ome omm omo omx oo- ooc ood oom ooo oox ox- oxc oxo oxx xcd xcx xdc xde xdm xed xee xem xex xmc xmd xmm xmo xmx xoc xod xom xoo xox xxo xxx