|   
		 
			 The ornamental design for a dumbbell as shown.  | 
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FIG. 1 is a perspective view of the dumbbell showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left-hand end view thereof; and
FIG. 6 is a right-hand end view of the dumbbell.
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