1, 2 ,3 ,4 5, 6, 7, 8 9, 10; 11 12, 13, 14, 15 16, 17, 18, 19 20, 21, 22, 23 24, 25, 26, 27 28, 29, 30, 31 32, 33, 34 35, 36, 37 38, 39, 40