The ornamental design for a seat, as shown and described.
FIG. 1 is a perspective view of a seat according to the design;
FIG. 2 is a front view of the seat of FIG. 1;
FIG. 3 is a rear view of the seat of FIG. 1;
FIG. 4 is a left side view of the seat of FIG. 1;
FIG. 5 is a right side view of the seat of FIG. 1; and,
FIG. 6 is a top view of the seat of FIG. 1.
The broken lines that are included in all of the figures of the drawings denote aspects of the seat that form no part of the claimed designs.
The bottom view of the illustrated design is omitted, because the bottom view is plain and unornamented and, therefore, forms no part of the claimed design.