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The ornamental design for a collapsible walker, as shown and described.
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FIG. 1 is a top view of a collapsible walker showing my new design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a right side elevational view thereof.
The broken line showing of a user of the collapsible walker shown in FIG. 3 is for demonstrative purposes only and forms no part of the claimed design.
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