let sum = CombinationsWithoutReplacement::new(factors, subset_size)?.fold(
				0,
				|accumulator_b, combination| {
					accumulator_b
						+ UnsignedMultiples::new(combination.iter().product(), limit).sum::<u32>()
				},
			);

				accumulator_a
					+ CombinationsWithoutReplacement::new(factors, subset_size)?.fold(
						0,
						|accumulator_b, combination| {
							accumulator_b
								+ UnsignedMultiples::new(combination.iter().product(), limit)
									.sum::<u32>()
						},
					)

				accumulator_a + sum

				accumulator_a
					- CombinationsWithoutReplacement::new(factors, subset_size)?.fold(
						0,
						|accumulator_b, combination| {
							accumulator_b
								+ UnsignedMultiples::new(combination.iter().product(), limit)
									.sum::<u32>()
						},
					)

				accumulator_a - sum