.
              
                                     D
                           e       e   s        e
                        s          p   i           s
                       p             c               p
                      i              a                  i
                     c               b                  c
                     a               l                   a
                     b           e       D             b
                     l            e         s             l
                      e           p       i             e
                       M           c    a          M
                           e          b            e
                                       l
                                       e