.
                                       E
                                x    x p    x
                              p      r e       p
                             r        s s         r
                            e       i    o         e
                           s       n      i         s
                           s       s      m        s
                            i       E      x        i
                             o       p    r       o
                               n      ess        n
                                 i     ion      i
                                    •    i    •
      ­                                   s
                                         m