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.

A bottom view thereof is omitted since it does not contain ornamental features. The heavy broken line showing of stitch lines in FIGS. 1 - 6 forms portions of the claimed design, while the light broken line showing of portions of the sofa in FIGS. 1 , 2 and 6 forms no part of the claimed design.