| 
 | The ornamental design for a sofa, substantially as shown. | |||||||||||||||||
FIG. 1 is a perspective view of the sofa showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a back elevation view thereof;
FIG. 4 is a top plan elevation view thereof;
FIG. 5 is a bottom plan elevation view thereof; and,
FIG. 6 is a side elevation thereof.
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