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Middle Line Loops. Middle of Rope Loop Knots. Knots commonly used to make a loop in the middle of a Line. 1.Directional Figure 8. The directional figure eight is a loop knot. It is a knot that can be made on the bight. The loop must only be loaded in the correct direction or the knot may fail. It is useful on a hauling line to create loops that can be used as handholds. 2. Alpine Butterfly Knot. The butterfly loop, also known as lineman's loop, butterfly knot, alpine butterfly knot, Swiss loop a