Aic
                     2                     2                 
                
            
                     1                     1                 
                
            
                     12                     12                 
                
            
                     1  1                     1                 
                
            
                     1  1                     1                 
                
            
                     12                     13                 
                
            
                     1  1                     1                 
                
            
                     3  3                     3                 
                
            
                     3  3                     3                 
                
            
                     1                     1