xxxxxxxx         
                                  xxx      xxx       
                                 xx          xxx     
                                xx         xxx x     
                                x         xx   xx    
                             xxxxxxx      x  x  x    
           xxxxxx          xxx x   xxx   xx  x  x    
         xx     xxx       xx   x     x   x xxxxxx    
        xx        xx      x    x     x   xxx         
       xx          x      x    x     xx              
       x           x     x     x    xxxxx            
     xxxxx         xx    x     x    x   x            
    xx   xx         x    x     x    x   xx           
    xxxxxxx         x    x     x    xx  xx           
                    x    x     x     xxxx            
                    x    x        xxxxxxxx           
                    x    x      xxx     xxxx         
                    x    x     xx      xx  x         
                    x    x     x      xx  x x        
                    x    x    xx      x   x x        
                    x    x    x       xxxxxxx        
                    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                    
   xx               x    x    x x        xx  x       
xx x           xx   xx   x    x x         xxxx       
  xx             x xx    x    x x          x         
xxxxxxx          xxx    xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
       xxxxxxxxxxxxxxxxx                             
                                xxxx          xxx    
    x x                         xx x            x    
    xxxx              xxx                            
      x               xx