return {
  -- Modkeys
  alt   = "Mod1",
  super = "Mod4",
  ctrl  = "Control",
  shift = "Shift",

  -- Mouse buttons
  leftclick     = 1,
  midclick      = 2,
  rightclick    = 3,
  scrolldowm    = 4,
  scrollup      = 5,
  sidedownclick = 8,
  sideupclick   = 9
}