1 b

1 b

2-3

2-3

4-5 a

4-5 a

6-7 a

6-7 a

8-9 a

8-9 a

10-11

10-11

12-13 b

12-13 b

14-15 b

14-15 b

16-17 b

16-17 b

18-19 b

18-19 b

20-21

20-21

22-23

22-23

24-25 a

24-25 a

26-27 a

26-27 a

28-29

28-29

30-31 b

30-31 b

32 a

32 a