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FIG. 1 is a front perspective view of an earplug according to our new design;
FIG. 2 is a back perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a side elevational view thereof, the other sides being identical; and,
FIG. 5 is a bottom plan view thereof.
The ornamental design for an earplug, as shown and described.