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NSNotification called twice

I've searched the archives and there was some mention of this before but no
solution that I found. Using the code below, when the Address Book.app
changes, the NSNotification gets called twice. Is there a way to limit this
to just get called once?

Thanks,
Jon


[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(ABChanged:)
name:kABDatabaseChangedExternallyNotification
object:nil];

- (void)ABChanged:(NSNotification *)notification {
NSLog(@"ABChanged");
}
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