We claim the ornamental design for a computer, as shown and described.
FIG. 1 is a top, front, right side perspective view of the computer according to our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevation view thereof; and,
FIG. 7 is a right side elevation view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines formed by dashes show unclaimed subject matter and form no part of the claimed design. The use of broken lines in conjunction with a bracket is used to designate that no specific length is being claimed.