local side = "back"

function alloff()
  rs.setBundledOutput(side, 0)
end

function set(color, state)
 color = colors[color] or colours[color]
 if not color then
  error("Invalid colour", 2)
 end
 local func = (state and colors.combine or colors.subtract)
 rs.setBundledOutput(side, func(rs.getBundledOutput(side), color))
end

function get(color)
 color = colors[color] or colours[color]
 return rs.testBundledInput(output_side, color)
end

function setside(s)
 side = s
end