The ornamental design for a set of keys for a keypad, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a set of keys for a keypad showing my new design;
FIG. 2 is a front elevational view of the first embodiment thereof;
FIG. 3 is a left side elevational view of the first embodiment thereof;
FIG. 4 is a right side elevational view of the first embodiment thereof;
FIG. 5 is a top plan view of the first embodiment thereof;
FIG. 6 is a bottom plan view of the first embodiment thereof;
FIG. 7 is a perspective view of a second embodiment thereof, for use in a tablet computer; and,
FIG. 8 is a perspective view of a third embodiment thereof, for use in a notebook computer.
The broken lines in the drawings depict portions of the set of keys for a keypad that form no part of the claimed design. The dot-dash lines in the drawings depict the environmental structures that form no part of the claimed design.