       
                                                          
                                                     
                                             
             
   6        
1.              6    
2.       4    
3.          
4.           
5.         
6.            
7.               
8.       1         
      16  18           
          
    
       
                   
                   
   
     
                  
                    
   
                    
                   
      
                  
                   
             
                   
                     
   
                   
                    
   
                     
                    
   
    
             
            
 
            
             
 
            
             
             
            
             
 
            
             
 
             
            
 
             
            
 
             
            
 
   
         
       
 
        
         
 
        
         
       
         
        
 
         
         
 
         
       
 
         
        
 
          
        

        
         

        
        

        
              
    
         
              

         
        

        
        

         
        

         
        
 
          