, .
 

1.
.

(
3c, 4a,4b, 4c ) .

.

, , ,
´.

.


2.
.

S (3c, 4a,4b, 4c ) , , ( ), .

.

(2a,2c,3a,3b) , S   , .
.

3.
1. . .
2. .

 

 

 
 

 

 
    
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