4
1
( )
2
3
4
5
1
6
7
8
9
10
Lb
La
La
Lb
A
11
4
5
6
12
13
14
( ) ( ) ( ) ( ) ( ) ( ) ( )
15
(c)
16
A
18
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
