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import turtle turtle.bgpic("forest.gif") pen = turtle.Pen() turtle.addshape("spider.gif") pen.shape("spider.gif") pen.color("#FFFFFF") def web(length):   for i in range(6):     for i in range(3):       pen.forward(length)       pen.left(120)     pen.left(360/6) web(60) web(120) web(180) web(240) web(300)    turtle.done()