FIG. 1 is a front perspective view of a first version of our design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a bottom plan view;
FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. 2;
FIG. 7 is a fragmentary cross-sectional view of a portion of FIG. 6;
FIG. 8 is a left side elevational view;
FIG. 9 is a right side elevational view;
FIG. 10 is a cross-sectional view taken along the line 10-10 of FIG. 2;
FIG. 11 is a fragmentary cross-sectional view taken of a portion of FIG. 10;
FIG. 12 is a fragmentary cross-sectional view taken of a portion of FIG. 10;
FIG. 13 is a front perspective view of a second version of our design;
FIG. 14 is a front elevational view;
FIG. 15 is a rear elevational view;
FIG. 16 is a top plan view;
FIG. 17 is a bottom plan view;
FIG. 18 is a cross-sectional view taken along the line 18-18 of FIG. 14;
FIG. 19 is a fragmentary cross-sectional view of a portion of FIG. 18;
FIG. 20 is a left side elevational view;
FIG. 21 is a right side elevational view;
FIG. 22 is a cross-sectional view taken along the line 22-22 of FIG. 14;
FIG. 23 is a fragmentary cross-sectional view taken of a portion of FIG. 22; and,
FIG. 24 is a fragmentary cross-sectional view taken of a portion of FIG. 22, wherein the oval-shaped broken lines of FIGS. 6, 7, 10-12, 18, 19, and 22-24 form no part of the claimed design.