public static String organizingContainers(List<List<Integer>> container) {
// Write your code here
		List<Integer> colorSum = new ArrayList<>();
		List<Integer> containerSum = new ArrayList<>(); 

		Collections.sort(container, Comparator.comparing(list -> list.stream().reduce(0, (a, b) -> a + b)));

		for (int i = 0; i < container.size(); i++) { 
				int sum = 0;  
				for (int j = 0; j < container.get(i).size(); j++) { 
						sum += container.get(i).get(j); 
						if (colorSum.size() == j) {
								colorSum.add(container.get(i).get(j)); 
						}
						else { 
								colorSum.set(j, colorSum.get(j) + container.get(i).get(j));
						} 
				} 
				containerSum.add(sum);  
		}  

		Collections.sort(containerSum); 
		Collections.sort(colorSum);  

		if (!containerSum.equals(colorSum)) {
				return "Impossible"; 
		}

		return "Possible"; 
}