The ornamental design for a cassette, as shown and described.
FIG. 1 is a front, bottom, right side perspective view of a cassette in accordance with our new design;
FIG. 2 is a front elevational view of the cassette shown in FIG. 1;
FIG. 3 is a rear elevational view of the cassette shown in FIG. 1;
FIG. 4 is a left-side elevational view of the cassette shown in FIG. 1;
FIG. 5 is a right-side elevational view of the cassette shown in FIG. 1;
FIG. 6 is a top plan view of the cassette shown in FIG. 1;
FIG. 7 is a bottom plan view of the cassette shown in FIG. 1; and,
FIG. 8 is an enlarged perspective view of detail area 8 circumscribed within FIG. 1.
All broken lines and the areas adjacent to the shaded surfaces in FIG. 1-3 depict environmental subject matter that forms no part of the claimed design. The broken line surrounding FIG. 8 and the relevant area in FIG. 1 indicate the boundaries of the enlarged detail and form no part of the claimed design. All other broken lines and areas in the drawings depict environmental subject matter that forms no part of the claimed design.