while true do
  os.pullEvent("redstone")
  if rs.getInput("back") then
   turtle.suckDown()
   turtle.refuel()
   turtle.suckDown()
   turtle.suckDown()
turtle.up()
turtle.up()
turtle.up()
turtle.up()
turtle.up()
turtle.select(1)
  turtle.place()
  turtle.up()
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
  turtle.up()
  turtle.select(2)
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
  turtle.down()
  turtle.down()
  turtle.down()
  turtle.down()
  turtle.down()
  turtle.down()
  turtle.down()
  turtle.down()
  redstone.setOutput("front", true)
sleep(60)
  redstone.setOutput("front", false)
  end
 end