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