public static void DemoInvertibleArrows()
{
Console.WriteLine("\t-- Invertible arrows demo --\n");
InvertibleArrow <int, int> arrow = Op.ArrowFunc((int x) => x * 2 + 5).Arr((int y) => (y - 5) / 2);
InvertibleArrow <int, string> arrow2 = Op.ArrowFunc((int x) => x.ToString()).Arr((string y) => Convert.ToInt32(y));
InvertibleArrow <int, string> arrow3 = arrow.Combine(arrow2);
string result = arrow3.Invoke(3);
Console.WriteLine("3 into the arrow gives {0}", result);
Console.WriteLine("{0} into the inverted arrow gives {1}", result, arrow3.Invert().Invoke(result));
}