if rs.getInput("left", true) then
  turtle.refuel()
  for i = 0,4,1 do
    turtle.select(3)
    turtle.place()
    turtle.select(2)
    for j = 0,4,1 do
      turtle.place()
    end
    sleep(1)
    turtle.dig()
    turtle.forward()
  end
  for i = 0,4,1 do
    turtle.back()
  end
end
else then
  os.reboot()
end