We claim the ornamental design for a sink, as shown and described.
FIG. 1 is a perspective view of an embodiment of the claimed design;
FIG. 2 is a front view of the design shown in FIG. 1;
FIG. 3 is a top view of the design shown in FIG. 1;
FIG. 4 is a side view of the design shown in FIG. 1;
FIG. 5 is a cross-sectional view of the design shown in FIG. 1 taken along line 5-5 in FIG. 3; and,
FIG. 6 is a cross-sectional view of the design shown in FIG. 1 taken along line 6-6 in FIG. 3.
The ornamental design which is claimed is shown in solid lines in the drawings.
The broken lines in the drawings show portions of the sink that form no part of the claimed design. Broken lines formed by equal length dashes (i.e., dash-dash) show unclaimed portions of the design.