xxxxxxx  xxxxxx  xxxxxx  xxxxxxx
x     x                        x
x  s  x                        x
x     xxxxxxxxxx     s         x
x              x               x
x              x               x
xxxx           x               x
   x           x                
   x                            
x  xxx                         x
x    x         x               x
x    x         x               x
x    xxxxx  xxxx        e      x
x                              x
x                              x
                xxxx            
                xxxx            
x                 xx           x
x                 xx           x
x           xxxxxxxxxxxxxx     x
x           xxxxxxxxxxxxxx     x
x                 xx           x
x                 xx           x
                  xx            
            s     xx            
x                 xx           x
x                 xx           x
x                              x
x                              x
x                              x
x                              x
xxxxxxx  xxxxxx  xxxxxx  xxxxxxx