public static void main(String[] args) {

		List<? extends Chewable> list1 = new ArrayList<Meat>(); // Line 16

		List<Chewable> list2 = new ArrayList<Chewable>(); // Line 17

		List<Meat> list3 = new ArrayList<Meat>(); // Line 18

		list1 = printSize(list1); // Line 20

		//list2 =printSize(list2); // commented because there is a mistake  Line 21

		//list3 = printSize(list3); //commented because there is a mistake Line 22

	}