Mask

FIG. 1 is a top, front perspective view of a mask, showing my new design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a top, rear perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the mask, which form no part of the claimed design.