|   
		 
			 The ornamental design for water softener, as shown.  | 
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FIG. 1 is a perspective view of a water softener showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a left side elevation thereof;
FIG. 4 is a rear elevation thereof;
FIG. 5 is a right side elevation thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
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