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I claim the ornamental design for a portable sidewalk, as shown and described.
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FIG. 1 is a top, front, right perspective view of the portable sidewalk of the present invention.
FIG. 2 is a bottom, front, right perspective view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a rear elevation view thereof.
FIG. 7 is a left side elevation view thereof.
FIG. 8 is a right side elevation view thereof.
FIG. 9 is a top, front, right perspective view thereof, showing the elements therein disconnected; and,
FIG. 10 is a bottom, front, right perspective view thereof, showing the elements therein disconnected.
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