xxxxxxx  xxxxxx  xxxxxx  xxxxxxx
x             x  x             x
x   s        x    x     s      x
x           x      x           x
x          x        x          x
x   m     x          x     c   x
xxxx  xxxx      e     xxx  xxxxx
          x          x          
           x        x           
x           x      x           x
x            x    x            x
x             x  x             x
x                              x
x                              x
x                              x
                                
                       s        
x                              x
x                              x
x                              x
x             x  x             x
x            x    x            x
x           x      x           x
           x        x           
          x          x          
xxxxx  xxx     e      xxxxx  xxx
x   c     x          x     m   x
x          x        x          x
x     s     x      x    s      x
x            x    x            x
x             x  x             x
xxxxxxx  xxxxxx  xxxxxx  xxxxxxx