b₂₁

b₂₂

b₂₃

b₂₄

b₂₅

b₂₆

b₂₇

b₂₈

b₂₉

b₃₀

4

4

7

7

1

1

4

4

7

7

5

5

8

8

2

2

5

5

8

8

6

6

9

9

3

3

6

6

9

9

10

16

10

13

22

25

19

25

19

22

11

17

11

14

23

26

20

26

20

23

12

18

12

15

24

27

21

27

21

24