Filter

FIG. 1 is a perspective view of a filter;

FIG. 2 is a right side elevation view of the filter;

FIG. 3 is a front elevation view of the filter;

FIG. 4 is a left side elevation view of the filter;

FIG. 5 is a rear elevation view of the filter;

FIG. 6 is a top plan view of the filter; and,

FIG. 7 is a bottom plan view of the filter.

Broken lines shown in the drawing views are included for illustrative purposes only and form no part of the claimed design.