The ornamental design for a cot, as shown and described.
FIG. 1 illustrates a top perspective view of a cot according to the present invention;
FIG. 2 shows a front view of the cot, including removable top rail, according to the present invention, the front view and a back view of the cot are identical;
FIG. 3 shows a right side view of the cot, including removable top rail, according to the present invention, the right side view and a left side view of the cot are identical;
FIG. 4 depicts a top view of the cot according to the present invention;
FIG. 5 shows a bottom view of the cot according to the present invention; and,
FIG. 6 illustrates a bottom perspective view of the cot according to the present invention.
The broken lines in the drawings illustrated portions of the cot that form no part of the claimed design.