sS ai_findNumberCalculationFunction1(L<Double> numbers, Double result) {
  if (l(numbers) != 2) null;
  for (S f : mL("Number Calculation Functions")) pcall {
    Number out = cast callAndMake(f, first(numbers), second(numbers));
    if (eq(toDouble(out), result))
      ret f;
  }
  null;
}