20

1 giới thiệu 

2 1 

3 2 

4 3 

5 4 

6 5 

7 6 

8 7. 

9 8 

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23 22 

24 23hhh 

25 24 

26 25 

27 26 

28 27 

29 28 

30 29h+ một 

31 29h+ hai 

32 30 

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34 32 

35 33 

36 34 

37 35 

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39 37 

40 38h 

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47 45 