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The ornamental design for an air cleaner, as shown and described. |
FIG. 1 is a perspective view;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a side elevational view with the opposite side being a mirror image;
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom plan view.
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