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The ornamental design for a door stopper, as shown and described. |
FIG. 1 is a front elevational view of the door stopper showing my new design, the broken line showing of a portion of a door and floor being for illustrative purposes only;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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