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   x       x  
