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 elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The evenly spaced broken lines illustrating portions of the washing machine are for environmental purposes only and form no part of the claimed design.
The uneven dot-dash broken lines in the figures represent a boundary line and form no part of the claimed design.