private static void printLargestSumOfHourglasses(List<List<Integer>> arr) {
        int result = -63;
        for (int row = 0; row < 4; row++) {
            for (int col = 0; col < 4; col++) {
                int current = 0;
                current += arr.get(row).subList(col, col + 3).stream().mapToInt(x -> x).sum();
                current += arr.get(row + 1).get(col + 1);
                current += arr.get(row + 2).subList(col, col + 3).stream().mapToInt(x -> x).sum();
                
                result = Math.max(result, current);
            }
        }
        System.out.println(result);
    }