∘ 4 ∘

1 ∘ 1 ∘ 

2 ∘ 2 ∘ 

3 ∘ 3 ∘ 

4 ∘ 4 ∘ 

5 ∘ 5 ∘ 

6 ∘ 6 ∘ 

7 ∘ 7 ∘ 

8 ∘ 8 ∘ 

9 ∘ 9 ∘ 

10 ∘ 10 ∘ 

11 ∘ 11 ∘ 

12 ∘ 12 ∘ 

13 ∘ 13 ∘ 

14 ∘ 14 ∘ 

15 ∘ 15 ∘ 