The ornamental design for a computer, as shown and described.
FIG. 1 is a perspective view of a computer showing our new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof; and
FIG. 4 is a top plan view thereof; and,
FIG. 5 is an enlarged cross sectional view cut along the line 5-5 between the lines 5′-5′ of FIG. 4.
The short-dash-long-dash lines immediately adjacent to the solid lines in FIGS. 1 and 4 define the boundaries of the claimed design only; all other broken lines are for environment only and form no part of the claimed design.