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The ornamental design for a knife sharpener, as shown and described. |
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FIG. 1 is a top perspective view of a knife sharpener, showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side, elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side, elevational view thereof; and
FIG. 8 is a rear elevational view thereof.
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