I claim an ornamental design for a chair, as shown and described.
FIG. 1 is a perspective view of a chair in accordance with my new design.
FIG. 2 is a front elevational view of the chair in FIG. 1.
FIG. 3 is a rear elevational view of the chair in FIGS. 1 and 2.
FIG. 4 is a side elevational of the chair in FIGS. 1-3, taken from the right in FIG. 2, the opposing side elevational view being a mirror image of FIG. 4; and,
FIG. 5 is a top plan view of the chair in FIGS. 1-4, the bottom forming no part of the claimed design.