FIG. 1 is a top frontal perspective view of a mop according to our new design;

FIG. 2 is a front view of the mop shown in FIG. 1;

FIG. 3 is a back view of the mop shown in FIG. 1;

FIG. 4 is a left side view of the mop shown in FIG. 1;

FIG. 5 is a right side view of the mop shown in FIG. 1;

FIG. 6 is a top view of the mop shown in FIG. 1; and,

FIG. 7 is a bottom view of the mop shown in FIG. 1.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.