(1)1 - 1 = (2)3 - 1 = (3)1 - 1 = (4)4 - 1 = (5)1 - 1 = (6)3 - 3 = (7)1 - 1 = (8)4 - 4 = (9)1 - 1 = (10)2 - 1 = (11)3 - 1 = (12)4 - 4 = (13)2 - 1 = (14)3 - 2 = (15)4 - 1 =