.
                                   F
                          r      r   e      r
                       e         e   F         e
                      e             r              e
                     L              e               L
                    u               e                u
                    n            L    u             n
                    c           n        c            c
                    h           h        L           h
                     F            u     n            F
                       r               c              r
                         e             h           e
                             e         F         e
                                        r
                                        e
                                        e