We claim the ornamental design for a sink, as shown and described.
FIG. 1 is a perspective view of the claimed design;
FIG. 2 is a top view of the claimed design of FIG. 1;
FIG. 3 is a bottom view of the claimed design of FIG. 1;
FIG. 4 is a cross-sectional view of the claimed design of FIG. 1 taken along line 4-4 of FIG. 2;
FIG. 5 is a cross-sectional view of the claimed design of FIG. 1 taken along line 5-5 of FIG. 2; and,
FIG. 6 is a cross-sectional view of the claimed design of FIG. 1 taken along line 6-6 of FIG. 2.
The ornamental design that is claimed is shown in the drawings as solid lines and surfaces having surface shading. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. For example, broken lines formed by equal length dashes show unclaimed portions of the design. Broken lines formed of unequal length dashes (i.e., dash-dot) show boundaries between either claimed and unclaimed portions of the design or between unclaimed and unclaimed portions of the design.