The ornamental design for a sofa, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a front view of the sofa showing the headrests in a lowered position;
FIG. 2 is a front view of the sofa showing one headrest in a raised position;
FIG. 3 is a front view of the sofa showing both headrests in the raised position;
FIG. 4 is a left side perspective view of the sofa showing one section with the footrest in an extended position and the headrest in a raised position;
FIG. 5 is a left side perspective view of the sofa showing all sections with footrests extended and headrests raised;
FIG. 6 is a left side view of the sofa showing the headrests in the raised position, the right side being a mirror image thereof; and,
FIG. 7 is a rear view of the sofa showing the headrests in the raised position.