class Mysterator implements Iterator ( private int nextValue public Mysterator (int start) public boolean hasNext(O public Integer next) f nextValue start; return nextValue 64 int result = nextvalue ; nextvalue *= 2; return result; public static void main (String[] args) Iterator it new Mysterator (2) while (it.hasNext)) System.out.println(it.next)) 5. What is the useful invariant of the above iterator? Write it in the following form (two blanks)