Mask

[0001]FIG. 1 is a top front isometric view of a mask showing the claimed design;

[0002]FIG. 2 is a top rear isometric view thereof;

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

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

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

[0006]FIG. 6 is a right side elevation view thereof;

[0007]FIG. 7 is a left side elevation view thereof;

[0008]FIG. 8 is a top plan view thereof; and,

[0009]FIG. 9 is a bottom plan view thereof.

[0010]The dashed broken lines in the figures show portions of the mask that form no part of the claimed design.

[0011]The dot-dash broken lines in the figures show boundaries that form no part of the claimed design.