The ornamental design for a seat, as shown and described.
FIG. 1 shows a perspective view of a first embodiment of the seat in accordance with the new design.
FIG. 2 shows a front elevation view of the embodiment of FIG. 1.
FIG. 3 shows a rear view of the embodiment of FIG. 1.
FIG. 4 shows a top view of the embodiment of FIG. 1; and,
FIG. 5 shows a side view of the embodiment of FIG. 1.
The short broken lines showing stitching on the cushions, arms, backrest and seat illustrate stitching that forms a part of the claimed design. All other broken lines, including the longer broken lines in FIGS. 1 and 5, illustrate portions of the seat that form no part of the claimed design.