1 a

1 a

1 b

1 b

2

2

3

3

4

4

5 a

5 a

5 b

5 b

6

6

7

7

8

8

9 a

9 a

9 b

9 b

10 a

10 a

10 b

10 b

11

11

12

12

14

14

13

13

15

15

16 a

16 a