->21.

1 ->1. 

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3 ->3. 

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6 ->6. 

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10 ->10. 

11 ->11. 

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13 ->13. 

14 ->14. 

15 ->15. 

16 ->16. 

17 ->17. 

18 ->18. 

19 ->19. 

20 ->20. 

21 ->21. 

22 ->22. 

23 ->23. 

24 ->24. 

25 ->25. 