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Sending a msg. to a class



I'll appreciate someone to help me understand the problem and suggest solution.
I'm trying to send a msg. to Pawn1 thru Pawn16 classes, but it doesn't work from inside the loop.
Thanks.

- (IBAction)resetAll: (id)sender {

// 	[toPawn1 showYourself];  		//--- This works fine.
// 	.......
// 	[toPawn16 showYourself];

/ but the following generates a warning: 'NSMutableString' may not respond to '-showYourself'
	
for (i = 1; i <= 16; ++i) {			
		NSMutableString *str = [NSMutableString stringWithFormat: @"toPawn%i", i];
		[ [str className] showYourself];		
		[str release];
	}
}




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