public static void main(String[] args) throws Exception {
        combinations(3, 4, 2).forEach(System.out::println);
    }

    public static List<DiscreteLocation> combinations(int... limits) {
        List<DiscreteLocation> result = new ArrayList<>();
        combinations(limits, new int[limits.length], 0, result);
        return result;
    }

    private static void combinations(int[] limits, int[] values, int currentDimension, List<DiscreteLocation> results) {
        boolean lastDimension = currentDimension == limits.length - 1;
        for (int i = 0; i < limits[currentDimension]; i++) {
            values[currentDimension] = i;
            if (lastDimension) {
                results.add(new DiscreteLocation(values));
            } else {
                combinations(limits, values, currentDimension + 1, results);
            }
        }
    }

    record DiscreteLocation(List<Integer> coordinates) {
        DiscreteLocation(int... coordinates) {
            this(IntStream.of(coordinates).boxed().toList());
        }
    }