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The ornamental design for a cat litter box, as shown and described. |
FIG. 1 is a perspective view of a cat litter box;
FIG. 2 is an elevational front view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is an elevational right side view thereof;
FIG. 5 is an elevational left side view thereof;
FIG. 6 is an elevational back view thereof; and,
FIG. 7 is a bottom plan view thereof.
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