.
                                    H
                         ­   o     o r        o
                          r        l t i         r
                         t         c u            t
                        i        l       t          i
                        c       u      r          c
                         u       e    h         u
                          l         o  r          l
                            t        tic         t
                             u      ul       u
                               r     tu     r
                                  e  re  e

.
                                    K
                         ­   e     e e      e
                         e        p t          e
                        P         h e          p
                        t        t       i         t
                        h       p      k        h
                         e       e      e        e
                          t        P    t      ­  t
                             i       he        i
                                p    t      p
                                      i
                                      P

a
                                     f
                             j      j o      j
                           o       r d        o
                          r         e s          r
                         d        c     o        d
                         e        r       r        e
                          s        t       f        s
                           c        j     o       c
                            o        r  d       o
                               r       •       r
                                   t    •    t

a
                                      p
                              a     a s      a
                             s       t a        s
                            t        t u          t
                           a      t       e       a
                           t       p      a        t
                           u       s      t        u
                             t        a   t        t
                               e       u        e
                                  •     t     •
                                        e

.  

                      S            S             S
                          h        h         h
                              i      i     i
              S       h    i      t     S     h    i     t
                               S    S    S
                          h        h        h
                     i              i               i
                  t                 t                   t

.
                                   I
                           n    n v       n
                         v       i s          v
                        i         i b           i
                       s        l     e         s
                        i       I      n         i
                         b      v    i         b
                          l       s   i         l
                           e      b l        e
                               •    e     •

.
                                  F
                          i     i r       i
                        r      e F        r
                       e       i  r         e
                      F         e            F
                      i       F      i         i
                      r       r      e        r
                       e       F   i         e
                         F       re         F
                           i       F        i
                             r     •       r
                                    e