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The ornamental design for a pencil sharpener, as shown and described.
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FIG. 1 is a perspective view of the pencil sharpener, showing my new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a right side elevational view thereof, the undisclosed opposite side being a mirror image.
FIG. 5 is a rear elevational view thereof.
FIG. 6 is a front elevational view thereof.
FIG. 7 is a perspective view of a pencil sharpener, showing a first modified embodiment of my new design.
FIG. 8 is a top plan view thereof.
FIG. 9 is a bottom plan view thereof.
FIG. 10 is a right side elevational view thereof, the undisclosed opposite side being a mirror image.
FIG. 11 is a rear elevational view thereof; and,
FIG. 12 is a front elevational view thereof.
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