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 39

 

  
   ,    Optimal ()    
 
  
 A
 
       
    4-5   
 
      
    1-2   
 B

 
,    4-5    
   
  
 
 
  
,     1-2    
    
  
   
Untitled-26 39 2018-07-16  4:54:02
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