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The ornamental design of a working aid, as shown and described.
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FIG. 1 is a side view of a first embodiment of a working aid incorporating the design of my invention;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a perspective bottom view thereof; and
FIG. 5 is a rear view thereof;
FIG. 6 is a front view thereof.
FIG. 7 is a side view of a second embodiment of a working aid incorporating the design of my invention;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a bottom perspective view thereof;
FIG. 11 is a rear view thereof; and,
FIG. 12 is a front view thereof.
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