c              
===             
\               
/   a           
===             
 b              
                
 100            
 ===            
 \     2        
 /    x         
 ===            
x = 1           
                
 100            
====            
\               
 \    1         
 /    -         
/     2         
====            
x = 1           
                
 100            
====            
\      2        
 \    x         
 /    --        
/      2        
====            
x = 1           
                
      c         
     ===        
     \          
     /       a  
     ===        
bbbbbbbbbbbb    
                
 c              
===             
\               
/   aaaaaaaaaaaa
===             
 b              
                
cccccccccccc    
     ===        
     \          
     /       a  
     ===        
      b