- using System; 
-   
- public class Test 
- { 
-   
-     class Person 
- { 
-     public int age; 
-     public Person() 
-     { 
-         age = 1; 
-     } 
- } 
-   
- class Customer : Person 
- { 
-     public Customer() 
-     { 
-         age += 1; 
-     } 
- } 
-   
- 	public static void Main() 
- 	{ 
- 		var c = new Customer(); 
-         Console.WriteLine(c.age); 
- 	} 
- } 
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