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			 The ornamental design for a adult walker, as shown.  | 
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FIG. 1 is a front view of an adult walker showing our new design;
FIG. 2 is a rear elevation thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
Santos, Larry J., Santos, Andria
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