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1

2

2a

3

4

5

16

7

14 17

11

10

9

18

8

6

13

12

15

17

A

A1

C

D

E

E1

F

H

I

L

E2

Fig.1

Fig.2 

Fig.3

Fig.4

Fig.5

Fig.6

19

Fig.7

17

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