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The ornamental design for an earplug, as shown and described.
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FIG. 1 is a side elevational view of an earplug showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side perspective view thereof;
FIG. 4 is a left side perspective view thereof;
FIG. 5 is a front corner perspective view thereof;
FIG. 6 is an end perspective view thereof;
FIG. 7 a is a side elevational view of a second embodiment of an earplug showing my new design;
FIG. 8 is a top plan view thereof;
FIG. 9 is a right side perspective view thereof;
FIG. 10 is a left side perspective view thereof;
FIG. 11 is a front, corner perspective view thereof; and,
FIG. 12 is an end perspective view thereof.
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