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copy attribute
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@interface MGACustomer : NSObject
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@property (nonatomic, readwrite, strong) NSString *name;
@property (nonatomic, readwrite, strong) NSString *address;
@property (nonatomic, readwrite, strong) NSArray *orders;
@property (nonatomic, readwrite, strong) NSDate *created;
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@end
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@interface MGACustomer : NSObject
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@property (nonatomic, readwrite, copy) NSString *name;
@property (nonatomic, readwrite, copy) NSString *address;
@property (nonatomic, readwrite, copy) NSArray *orders;
@property (nonatomic, readwrite, copy) NSDate *created;
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@end
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