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The ornamental design for a writing instrument, as shown. |
FIG. 1 is a left side perspective view of a writing instrument showing my new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front end elevational view thereof; and
FIG. 6 is a rear end elevational view thereof.
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