The ornamental design for a sofa, as shown and described.
FIG. 1 is a front side perspective view of one embodiment of a sofa in accordance with the present design;
FIG. 2 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a front side perspective view of an alternative embodiment in accordance with the present design of FIG. 1;
FIG. 8 is a left side elevational view of the alternative embodiment illustrated in FIG. 7, the right side elevational view being a mirror image thereof;
FIG. 9 is a front elevational view of the alternative embodiment illustrated in FIG. 7;
FIG. 10 is a rear elevational view of the alternative embodiment illustrated in FIG. 7;
FIG. 11 is a top plan view of the alternative embodiment illustrated in FIG. 7; and,
FIG. 12 is a bottom plan view of the alternative embodiment illustrated in FIG. 7.