xxxxxxx  xxxxxx  xxxxxx  xxxxxxx
xx                            xx
x                              x
x     s                    e   x
x                              x
x                              x
x                              x
                                
                                
x                              x
x                              x
x                              x
x                              x
x              xx              x
x              xx              x
             xxxxxx             
             xxxxxx             
x              xx              x
x              xx  s           x
x                              x
x                              x
x                              x
x                              x
                                
                                
x                              x
x                              x
x                              x
x     s                    e   x
x                              x
xx                            xx
xxxxxxx  xxxxxx  xxxxxx  xxxxxxx