The ornamental design for an chair, as shown and described.
FIG. 1 is a front and left side perspective view of a first embodiment of a chair showing my new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front and right side perspective view of a second embodiment of my new design showing an indicia of seat numbers on the right front side of the arm rest where the arm rest is attached to the seat shell;
FIG. 5 is a rear elevational view of a second embodiment of the chair in FIG. 4;
FIG. 6 is a partial front and right side perspective view thereof; and,
FIG. 7 is a front and left side perspective view of a third embodiment of the chair in FIG. 4 showing an indicia of seat numbers on the left side below the seat shell.
The broken line showing of a seat number in FIGS. 4-7 is for illustrative purposes only and forms no part of the claimed design.