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The ornamental design for an insulator, as shown and described.
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FIG. 1 is a perspective view of the insulator of the present design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view as seen from the left hand side of FIG. 2;
FIG. 4 is a side elevational view as seen from the right hand side of FIG. 2;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
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