1 2 1 2 1 2 1 2 (3,) 1 2 (3, 4, 5, 6) 1 2 () 1 2 (3, 4) 1 2 (3, 4, 5, 6, 7) 1 2 (3, 4, 5, 6, 7) 1 7 () 1 7 (8, 9) 1 2 (7,) 1 2 (3, 7, 8, 9)
