.
                                  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