.
                                         T
                              a       a  s         a
                           s           t  e            s
                         t               s                 t
                        e                j                  e
 ­                       s                u                   s
                        j              s      t                ­j
                        u             l       i              u
                         s             k     e              s
                           t               C                t
                             l             H              l
                                i           l            i
                                   k       C        k
                                      e    K    e
    ­                                        E
                       ­                     N