using System;
 
public class Programa
{
    public class Impresora
    {
        public virtual void Imprimir()
        {
            Console.WriteLine ("Tareas básicas de impresión.");
        }
    }
 
    public class Multifuncional : Impresora
    {
        public override void Imprimir()
        {
            Console.WriteLine ("Tareas especializadas de impresión.");
        }
    }
 
    public static void Main ()
    {
        Impresora impresora = new Impresora();
        impresora.Imprimir();
 
        impresora = new Multifuncional();
        impresora.Imprimir();
    }
}

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