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The ornamental design for a walking stick, as shown and described.
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FIG. 1 is a perspective view of a walking stick embodying my invention with support legs in an open position;
FIG. 2 is a front elevational view thereof, the rear elevational view being the same;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view of a walking stick embodying my invention with support legs in a retracted position;
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.
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