We claim the ornamental design for a washing machine, as shown and described.
FIG. 1 is a front perspective view of a washing machine showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an enlarged view of the encircled portion in FIG. 1.
The broken lines in the figures show portions of the washing machine which form no part of the claimed design. The dot-dash broken lines in the figures represent a boundary of the claimed design and form no part thereof.
The dot-dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.