Mask

[0001]FIG. 1 is a perspective view of a mask, showing my new design;

[0002]FIG. 2 is a front elevation view thereof;

[0003]FIG. 3 is a rear elevation view thereof;

[0004]FIG. 4 is a left side elevation view thereof;

[0005]FIG. 5 is a right side elevation view thereof;

[0006]FIG. 6 is a top plan view thereof; and,

[0007]FIG. 7 is a bottom plan view thereof.

[0008]The washed-out lighter gray portions are for the purpose of illustrating portions of the mask which form no part of the claimed design. The broken lines immediately adjacent to and surrounding the dark gray photographic area represent the bounds of the claimed design and form no part thereof.