We claim the ornamental design for a sink, as shown and described.
FIG. 1 is a top, front, right perspective view of an embodiment of the claimed design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a cross-sectional view taken along Line 6-6 in FIG. 4; and,
FIG. 7 is a cross-sectional view taken along Line 7-7 in FIG. 4.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings form no part of the claimed design. Broken lines formed by equal length dashes show unclaimed subject matter. Broken lines formed of unequal length dashes (i.e., dash-dot) define bounds of the claimed design. Broken away symbols having a jagged element show that no particular length of the portion is claimed.