Sofa

FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines in FIGS. 1 and 3 - 5 show portions of the sofa that form no part of the claimed design.