I claim the ornamental design for a couch, as shown and described.
FIG. 1 is a perspective view of the claimed design;
FIG. 2 is a front view of the claimed design shown in FIG. 1;
FIG. 3 is a rear view shown in FIG. 1;
FIG. 4 is a side view shown in FIG. 1;
FIG. 5 is another side view shown in FIG. 1;
FIG. 6 is a top view shown in FIG. 1; and,
FIG. 7 is a bottom view shown in FIG. 1.
The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 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 claimed and unclaimed portions of the design.