using System;
public class Test
{
class Person
{
public int age;
public Person() {}
public Person(int age)
{
this.age = age;
}
}
class Customer : Person
{
public Customer(int age)
{
this.age += age;
}
}
public static void Main()
{
var c = new Customer(2);
Console.WriteLine(c.age);
}
}
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