xxxxxxx  xxxxxx  xxxxxx  xxxxxxx
x            x       x         x
x      c     x       x         x
x            x       x         x
x   xxxxxxx  x       x    s    x
x   x                xx        x
x   x                 x        x
    x         e       x         
    x                 x         
x   x                 xxxxx    x
x   x   t        s        x    x
x   x                   c x    x
x  xxx                    x    x
x  x x                    x    x
x    x             xxxxxxxx    x
     x                          
     x                          
x    x                x        x
x    xxxxx  xxxx      x        x
x              x      x        x
x              x      x        x
x       s      x      x  e     x
x              x      x        x
      P        x     xxxxxxx    
               x     x     x    
x     xxxxxxxxxx     x  x  x   x
x              x     x  x  x   x
x              x   e x  x  x   x
x    P         x     x  x  x s x
x              xxxxxxx  x  x   x
x                              x
xxxxxxx  xxxxxx  xxxxxx  xxxxxxx