-

2--1 " ( N1)"

2--1

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( N1)

                     

N

**

( )

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

       
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3 !

- , .