The ornamental design for a chair, as shown and described.
FIG. 1 is a front right perspective view of a chair showing my new design;
FIG. 2 is a rear left perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof, the left side view being a mirror image;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is an enlarged fragment of a portion of the chair shown in FIG. 1 and labelled 7; and,
FIG. 8 is an enlarged fragment of a portion of the chair shown in FIG. 5 and labelled 8.
The fragmentary showing of a weave pattern in FIGS. 1-5, and shown in detail in FIGS. 7 and 8, is understood to be repeated throughout the surfaces shown. The broken lines show environmental subject matter and form no part of the claimed design.