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The ornamental design for a 3 dimensional chessboard, as shown and described. #3#
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FIG. 1 is a front elevational view of the 3 dimensional chessboard showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a reduced top plan view thereof;
FIG. 6 is a reduced bottom plan view thereof, and,
FIG. 7 is a reduced perspective view thereof.
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