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The ornamental design for a clipboard, as shown and described.
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FIG. 1 is a front perspective view of a clipboard showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a side elevation view of one side thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a side elevation view of the other side of that shown in FIG. 4.
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