We claim the ornamental design for a stapler, as shown and described.
FIG. 1 is an isometric view from above a first side and a first end of a stapler of our new design;
FIG. 2 is an elevation view of the first end of the stapler of FIG. 1;
FIG. 3 is an elevation view of a second end of the stapler of FIG. 1, the second end opposing the first end of the stapler illustrated in FIG. 2;
FIG. 4 is an elevation view of the first side of the stapler of FIG. 1;
FIG. 5 is an elevation view of a second side of the stapler of FIG. 1, the second side opposing the first side of the stapler illustrated in FIG. 4;
FIG. 6 is a top plan view of the stapler of FIG. 1; and,
FIG. 7 is a bottom plan view of the stapler of FIG. 1.
Portions of the stapler are shown in broken line in the drawing views and are included for illustrative purposes and form no part of the claimed design.