oc试题-以下代码输出结果是什么

NSMutableDictionary *mutableDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"lisi",@"name",[NSNumber numberWithInt:20],@"age", nil];                           
[mutableDic setObject:@"89" forKey:@"num"];
NSLog(@"mutableDic4 = %@",mutableDic);

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