startup

i = 0
  repeat
    turtle.select(2)
    turtle.refuel(1)
    turtle.select(1)
    turtle.dig()
    turtle.place()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    i = i + 1
  until i == 4
  sleep(120)
  i = 0
  repeat
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.dig()
    turtle.place()
    i = i + 1
  until i == 4