xxxxxxx  xxxxxx  xxxxxx  xxxxxxx
x                              x
x   m      c        c       m  x
x               s              x
x   c      m        m       m  x
x                              x
xxxxxxxxxxxx        xxxxxxxxxxxx
                                
                                
xx                     xxxxxxxxx
xx                             x
xx                             x
xx                      e      x
x                              x
x                              x
   22222222     s               
   22222222                     
xxxxxxxxxxxx                   x
xxxxxxxxxxxx             c     x
xxxxxxxxxxxx                   x
xxxxxxxxxxxx      xxxxxxxxxxxxxx
xxxxxxxxxxxx      xxxxxxxxxxxxxx
xxxxxxxxxxxx      xxxxxxxxxxxxxx
                                
                                
xxxxxxxx         e             x
x      x                       x
x  t   x                       x
x      x                       x
x  s                           x
x                              x
xxxxxxx  xxxxxx  xxxxxx  xxxxxxx