Flip-flop

FIG. 1 is a front, left, top perspective view of a flip-flop, showing our new design; FIG. 2 is a rear, right, bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side view of the enlarged scale thereof; FIG. 6 is a right side view of the enlarged scale thereof; FIG. 7 is a top plan view thereof; FIG. 8 is an enlarged view of detail 8 in FIG. 3 ; FIG. 9 is an enlarged view of detail 9 in FIG. 4 ; FIG. 10 is an enlarged view of detail 10 in FIG. 4 ; FIG. 11 is an enlarged view of detail 11 in FIG. 5 ; and, FIG. 12 is an enlarged view of detail 12 in FIG. 6 . The dashed broken lines illustrate portions of the flip-flop that form no part of the claimed design. The short-short-long dashed broken lines immediately adjacent to the claimed areas in the views represent the boundaries of the design and form no part of the claimed design. The dash-dot-dash broken lines are for notating enlarged views and form no part of the claimed design.