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An ornamental design for a downspout extension, as shown.
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FIG. 1 is a perspective view of the downspout extension;
FIG. 2 is a right side view of the downspout extension;
FIG. 3 is a top view of the downspout extension;
FIG. 4 is a left side view of the downspout extension;
FIG. 5 is a bottom view of the downspout extension;
FIG. 6 is an enlarged left end view of the downspout extension; and,
FIG. 7 is an enlarged right end view of the downspout extension.
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