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The ornamental design for a whistle, as shown and described. |
FIG. 1 is a perspective view of a whistle showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevational view thereof, the left side being a mirror image; and
FIG. 6 is a bottom plan view thereof.
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