∆2

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 