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