The ornamental design for a robot, as shown and described.
FIG. 1 is an angled view of a robot embodying an aspect of the design;
FIG. 2 is a front view of the robot of FIG. 1;
FIG. 3 is a back view of the robot of FIG. 1;
FIG. 4 is a top view of the robot of FIG. 1;
FIG. 5 is a bottom view of the robot of FIG. 1;
FIG. 6 is a left view of the robot of FIG. 1; and
FIG. 7 is a right view of the robot of FIG. 1.
FIG. 8 is an angled view of a robot embodying another aspect of the design;
FIG. 9 is a front view of the robot of FIG. 8;
FIG. 10 is a back view of the robot of FIG. 8;
FIG. 11 is a top view of the robot of FIG. 8;
FIG. 12 is a bottom view of the robot of FIG. 8;
FIG. 13 is a left view of the robot of FIG. 8; and,
FIG. 14 is a right view of the robot of FIG. 8.
The subject matter in broken lines, showing environment or structure, is disclaimed and is provided for illustrative purposes only and forms no part of the claimed design.