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			 The ornamental design for a spring shoe, as shown and described.  | 
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FIG. 1 is a front elevational view of a spring shoe showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line showing of a shoe in FIGS. 1-5 is for illustrative purposes only and forms no part of the claimed design.
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