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The ornamental design for a lifting foil, as shown and described.
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FIG. 1 is a perspective view of a lifting foil embodying my new design, as seen from an observing position located upwardly, forward and on the port side thereof;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof.;
FIG. 4 is an elevation view taken from the port side thereof.;
FIG. 5 is an elevation view taken from the starboard side thereof;
FIG. 6 is a top plan view; and,
FIG. 7 is a bottom plan view.
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