We claim the ornamental design for a computer, as shown and described.
FIG. 1 is a top, front, right perspective view of a computer showing our new design;
FIG. 2 is a bottom, front, left perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a right elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dash-dash broken lines shown in the drawings represent environment only and form no part of the claimed design, the jagged lines shown broken away indicate an indeterminate length and the appearance of any portion of the article between the lines forms no part of the claimed design.