private static boolean isSomethingWillBeEaten(ArrayList<String> list) {
		boolean wolfAndSheetTogether = list.contains(WOLF)
				&& list.contains(SHEET);
		boolean sheetAndCabbageTogether = list.contains(CABBAGE)
				&& list.contains(SHEET);
		return list.size() == 2
				&& (wolfAndSheetTogether || sheetAndCabbageTogether);
	}