I claim 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)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
1.1 is a top, right side perspective view of a sofa showing the claimed design;
1.2 is a top, rear, left side perspective view thereof;
1.3 is a top, front perspective view thereof;
1.4 is a top, front perspective view thereof with the seat cushion removed for clarity of disclosure;
1.5 is a bottom, front, left side perspective view of the removed seat cushion; and
1.6 is a top, left side perspective view of the sofa.