Seat and Backrest

FIG. 1 is a perspective view of the seat and backrest; FIG. 2 is a front elevational view of the seat and backrest; FIG. 3 is a rear elevational view of the seat and backrest; FIG. 4 is a left side elevational view of the seat and backrest, the right side of which is a mirror image; FIG. 5 is a top plan view of the seat and backrest; and, FIG. 6 is a bottom plan view of the seat and backrest. The broken line portions of the drawings are included to show portions of the article that form no part of the claimed design and represent environmental structure only.