The new and ornamental design for a chair, substantially as shown and described.
FIG. 1 is a frontal and left side perspective view of the chair showing my
new design; the right side portion being a mirror image of the left side
portion;
FIG. 2 is a rear slightly elevated view illustrating the rear, top and left
side portions of the chair, the right side portion being a mirror image of
the left side portion; and
FIG. 3 is a rear perspective view similar to FIG. 2 except at a more
rearward and elevated angle.