The ornamental design for a computer, as shown and described.
FIG. 1 is a front perspective view of a computer, showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is another rear perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a bottom view thereof;
FIG. 10 is an enlarged view of the encircled portion labeled as 10 in FIG. 9; and,
FIG. 11 is an enlarged view of the encircled portion labeled as 11 in FIG. 7.
The broken lines immediately adjacent to the claim depict the bounds of the claimed design, while all other broken lines are directed to environment. The broken lines form no part of the claimed design.