The ornamental design for a chair, as shown and described.
FIG. 1 is a left side elevation view of a chair showing my new design, the
right side being a mirror image thereof;
FIG. 2 is a front perspective view thereof, the seat and backrest having
been removed for ease of illustration; and,
FIG. 3 is a front perspective view thereof; the spiral grooves on the seat
and backrest are cut into the sheet metal, the undisclosed views are plain
.