The ornamental design for a computer, as shown and described.
FIG. 1 is a front, perspective view of a first embodiment of a computer showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is another rear perspective view thereof;
FIG. 10 is a front, perspective view of a second embodiment thereof;
FIG. 11 is a front view thereof;
FIG. 12 is a rear view thereof;
FIG. 13 is a left side view thereof;
FIG. 14 is a right side view thereof;
FIG. 15 is a top view thereof;
FIG. 16 is a bottom view thereof;
FIG. 17 is a rear perspective view thereof; and,
FIG. 18 is another rear perspective view thereof.
The transparent display screen has a black border coincident with a peripheral portion of the screen. The rear surface of the computer is black. The portion of the computer shown in gray shading represents a metallic-looking surface that preferably contrasts with the black portions. Throughout the drawings, the apertures on the bottom rim of the computer, as shown for example in FIG. 7, are in broken lines. All broken lines represent environmental subject matter that forms no part of the claimed design.