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I claim the ornamental design for a stackable step, as shown and described. |
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FIG. 1 is a side view of the stackable step in accordance with the invention.
FIG. 2 is a top view of the stackable step in accordance with the invention.
FIG. 3 is a bottom plan view of the stackable step in accordance with the invention.
FIG. 4 is an end view of the stackable step in accordance with the invention.
FIG. 5 is a cross-sectional view taken at 5--5 of FIG. 4; and,
FIG. 6 is a cross-sectional view taken at 6--6 of FIG. 1.
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