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C
6       ,  
      
  .
B
         . 
    ( )  .
7       
     .
       
    .
     
-        .
-          
  .
-         
       
     .
-        .
  
1           
.
2         
        () .
   :    
.
3          .
C
4       .  
    .

1           
  0.
2    .
C
3     .    
         .
4         
   .
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