The ornamental design for a bus, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a front perspective view of a bus in accordance with the present design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a rear perspective view thereof;
FIG. 5 is a left side elevational thereof; and,
FIG. 6 is a right side elevational thereof.
The broken lines depict portions of the bus that form no part of the claimed design.