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The ornamental design for a writing instrument, as shown. |
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FIG. 1 is a perspective view of the writing instrument of the present invention;
FIG. 2 is a front view in elevation of the writing instrument of FIG. 1;
FIG. 3 is a side view in elevation of the writing instrument of FIG. 1;
FIG. 4 is a rear view in elevation of the writing instrument of FIG. 1;
FIG. 5 is a top plan view of the writing instrument of FIG. 1; and,
FIG. 6 is a cross section plan view of the writing instrument of FIG. 1.
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