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The ornamental design for a office chair, as shown and described.
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FIG. 1 is a perspective view of a office chair showing my new design;
FIG. 2 is a front view of the design;
FIG. 3 is a rear view of the design;
FIG. 4 is a left side view of the design;
FIG. 5 is a right side view of the design;
FIG. 6 is a top view of the design; and,
FIG. 7 is a bottom view of the design.
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