FIG. 1 is a top perspective view of my ornamental design for a sandal;
FIG. 2 is a left side elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view thereof; and
FIG. 8 is a top perspective view of a second embodiment of my ornamental design for a sandal;
FIG. 9 is a left side elevation view of the embodiment shown in FIG. 8;
FIG. 10 is a right side elevation view of the embodiment shown in FIG. 8;
FIG. 11 is a top plan view of the embodiment shown in FIG. 8;
FIG. 12 is a bottom plan view of the embodiment shown in FIG. 8;
FIG. 13 is a front elevation view of the embodiment shown in FIG. 8; and,
FIG. 14 is a rear elevation view of the embodiment shown in FIG. 8.
The broken lines in the drawings represent environment and form no part of the claimed design.