20         
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
 
            
16, 18         
            
 
            
 
            
 
            
 
            
 
            
 
            
17         
            
 
            
16         
            
17         
            
 
            
 
            
 
            
 
            
 15.7,16.5         
            
 
            
 
            
 
            
19         
            
16.5-14.5         
            
 
            
 
            
 
            
 
            
16, 17, 18         
            
16, 17