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I claim the ornamental design for a portable ramp, as shown and described.
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FIG. 1 is a perspective view of a portable ramp showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof, the elevational view of the opposing side being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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