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1#import <Foundation/Foundation.h>2 3@interface Child : NSObject4@property(nonatomic, copy) NSString *name;5@end6 7@implementation Child8@end9 10@interface Parent : NSObject11@property(nonatomic, strong) Child *child;12@end13 14@implementation Parent15@end16 17int main(int argc, char **argv) {18 Child *child = [Child new];19 child.name = @"Seven";20 Parent *parent = [Parent new];21 parent.child = child;22 puts("break here");23 return 0;24}25