.
                                  B
                           r    r e   r
                         e      a k     e
                       a        f a        a
                     k            s            k
                    f              o ­            f
                   a               f               a
                  s                C                s
         ­         t             h    a              t
                  o           m      p            o
                  f            i         o            f
                  C            n      s           ­  C
                    h             B               h
                      a            r             a
                         m        e         m
                            p      a      p
                   ­            s    k   s
                                     f
                                     S
                                     t