MagnetTosser

local p = peripheral.wrap("left")

p.activate()

function waitForMagnet()
    while true do
        local x,y,z = p.getDistanceToTarget()
        if x,y,z == 0,-0.5,0 then
            break
        end
        sleep(.2)
    end
end

for x = 1,5 do
  for z = 1,3 do
    p.setTarget(x,0,z-2)
    waitForMagnet()
    p.toggle()
    while not p.isGrabbing() do end
    p.setTarget(x,3,z-2)
    waitForMagnet()
    p.toggle()
    while not p.isGrabbing() do end
  end
end

p.deactivate()