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The ornamental design for an office chair, as shown and described.
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FIG. 1 is a perspective view of an office chair showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is another perspective view of the office chair of FIGS. 1 through 7 with arms, adjustment mechanisms and a base being shown in broken lines for illustrative purposes only and forming no part of the claimed design.
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