Which of the following list of numbers form an AP? If they form an AP, write the next two terms: (i) 4, 10, 16, 22, \ldots (ii) 1, -1, -3, -5, \ldots (iii) -2, 2, -2, 2, -2, \ldots (iv) 1, 1, 1, 2, 2, 2, 3, 3, 3, \ldots