c-- ccc cce ccm cco ccx ce- cec cee cem ceo cex cmc cme cmm cmo cmx co- coc coe com coo cox cxc cxo cxx ec- ecc ece ecm eco ecx eec eee eem eeo eex em- emc eme emm emo emx eo- eoc eoe eom eoo ex- exc exe exo exx m-o mc- mcc mce mcm mco mcx mec mee mem meo mex mmc mme mmm mmo mmx moc moe mom moo mox mxc oc- occ ocm oco ocx oec oee oem oeo oex om- omc ome omm omo omx oo- ooc oom ooo oox ox- oxc oxo oxx xcx xee xem xex xmc xmm xmo xmx xoc xom xoo xox xxo xxx