static void Main(string[] args)
{
Facade facade = new Facade();
facade.OperacionAB();
Console.WriteLine(new string('-', 50));
facade.OperacionAC();
Console.WriteLine(new string('-', 50));
facade.OperacionBC();
Console.WriteLine(new string('-', 50));
facade.OperacionABC();
Console.WriteLine(new string('-', 50));
}
