Rubber farm

while true do
    turtle.select(2)
    while not turtle.compare() do
        print("no rubber")
        os.sleep(10)
        turtle.suck()
        turtle.suckUp()
        turtle.select(1)
        turtle.place()
        turtle.select(2)
        if turtle.getItemCount()>1 then
            turtle.dropDown(turtle.getItemCount()-1)
        end
    end
    print("rubber")
    rs.setOutput("bottom", true)
    os.sleep(1)
    rs.setOutput("bottom", false)
    os.sleep(1)
end