1

1

3

2

3-2

5

4

5-4

7

6

7-6

9

8

9-8

11

10

11-10

13

12

13-12

15

14

15-14

17

16

17-16

19

18

19-18

21

20

21-20

23

22

23-22

25

24

25-24

27

26

27-26