(1-2) 1-2 (1-2)' (1-2) (1-2) 1-2 (1-2)

(1-2) 1-2 (1-2)' (1-2) (1-2) 1-2 (1-2)

(1-2) 1-2 (1-2)'

(4) 5 (4)(5) (4)5 (4)(5) (4)5 6

5 6 (5) (4) (3) 4 (4) (3)' (2) 2 (1)

(2)' (1) 2 (1) (1-2) (1-2) 1-2 (1-2)