tree

repeat
    if redstone.getAnalogInput("left") == 0 then
        os.shutdown()
    end
    turtle.select(1)
    if turtle.compare() == true then
        sleep(5)
    else
        turtle.select(16)
        turtle.refuel(5)
        turtle.select(1)
        while turtle.detect() == true do
             turtle.dig()
             turtle.digUp()
             turtle.up
        end
        while turtle.detectDown() == false do
            turtle.down()
        end
        turtle.suck()
        turtle.turnRight()
        turtle.turnRight()
        i = 15
        while i > 1 do
           turtle.select(i)
           turtle.drop()
           i = i - 1
        end
        turtle.turnRight()
        turtle.turnRight()
        turtle.select(1)
        turtle.place()
    end
until 1 > 2