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The ornamental design for guitar teaching tool, as shown and described.
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FIG. 1 is a top view.
FIG. 2 is a bottom view.
FIG. 3 is a front view.
FIG. 4 is a back view.
FIG. 5 is a left side view.
FIG. 6 is a right side view; and,
FIG. 7 is an isometric view.
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