The ornamental design for a stylus set, as shown and described.
FIG. 1 is a perspective view of a stylus set showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an exploded view thereof.
The broken lines illustrate unclaimed portions and form no part of the claimed design. The dot-dash lines in the drawings define the boundary of the claim and form no part of the claimed design.