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			 The ornamental design for a hair curler, as shown and described.  | 
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FIG. 1 is a top plan view of the hair curler;
FIG. 2 is a frontal elevational view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a perspective view shown with the elastic band element in an extended, fastened configuration.
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