    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   x x  
