The ornamental design for a cracker, as shown and described.
The patent or application file contains at least one photograph executed in color. Copies of this patent or patent application publication with color photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a top view of a cracker showing my new design;
FIG. 2 is a right side view of the design shown in FIG. 1, wherein the left side view is a mirror image thereof; and,
FIG. 3 is a front view of the design shown in FIG. 1, wherein the rear view is identical thereto.