  x x x x   x x x   x x x x x
                             
x                 x   x      
                             
  x               x x        
                             
x       x x       x   x      
                             
  x       x       x          
                             
x x         x x   x x   x    
                             
x       x   x     x x        
                             
x x       x   x   x x   x    
