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__strong NSString *yourString = [[NSString alloc] initWithUTF8String:"string 1"];
__weakNSString *myString = yourString;
__unsafe_unretained NSString *theirString = myString;
yourString = nil;
NSLog(@"yourString:%p --- :%@",yourString,yourString);
NSLog(@"myString:%p --- :%@",myString,myString);
NSLog(@"theirString:%p --- :%@",theirString,theirString);
yourString:0x0 --- :(null)
myString:0x6861220 --- :string 1
theirString:0x6861220 --- :string 1