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The ornamental design for a kitchen sink, as shown. |
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FIG. 1 is a perspective view showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left end view thereof;
FIG. 4 is a right end view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a rear view thereof.
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