  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    
