internal static void Point(Numeral x, Numeral y)
{
Tuple <Numeral, Numeral> point1 = ChurchTuple <Numeral, Numeral> .Create(x)(y);
Numeral x1 = point1.Item1();
Numeral y1 = point1.Item1();
// Move up.
Numeral y2 = y1.Increase();
Tuple <Numeral, Numeral> point2 = ChurchTuple <Numeral, Numeral> .Create(x1)(y2);
}
public static T2 Item2 <T1, T2>(this Tuple <T1, T2> tuple) => ChurchTuple <T1, T2> .Item2(tuple);
public static T1 Item1 <T1, T2>(this Tuple <T1, T2> tuple) => ChurchTuple <T1, T2> .Item1(tuple);
