public static void printMaybe(LinkedHashMap<Integer, ArrayList<Integer>> maybe) {
		Util.dprint("Empty slots(with possible values): ");
		int count = 0;
		for (Entry<Integer, ArrayList<Integer>> e : maybe.entrySet()) {
			Integer key = e.getKey();
			ArrayList<Integer> value = e.getValue();
			String str = "Index " + key + ": ";
			for (Integer i : value) {
				str += i + " ";
			}
			Util.dprint(count + ">" + str);
			count++;
		}
	}