            
 
 
          
 
1                               
2                                  
3   
4                                
5                                             
6                                             
7                                      
8                                      
9    
10                       
11                              
12                              
13                          
14   
15                             
16       
17                              
18       
19                 
20                     
21              
22                        
23      
24                             
25    
26                             
27                                
28                                        
  
 
               
     A                                                                                       
                                                                                       
 
 
     B                                                             