sS ai_findNumberCalculationFunction1(L<Double> numbers) {
  ret empty(numbers) ? null : ai_findNumberCalculationFunction1(dropLast(numbers), last(numbers));
}

sS ai_findNumberCalculationFunction1(L<Double> numbers, double result) {
  if (l(numbers) != 2) null;
  for (S f : ai_numberCalculationFunctions()) pcall {
    if (ai_checkNumberCalculationFunction1(f, numbers, result))
      ret f;
  }
  null;
}