.
                                    f
                             o   i  n    o
                        o        g  e        o
                      d            r             d
                     f              f                f
                   o               i                  o
                 o             n      g               o
                d             e         r              d
                 f             f          i               f
                 o              n      g               o
                  o                 e                   o
                    d               r                d
                       f             f               f
                         o          i           o
                            o       n      o
                                 d  g  d
                                      e
                                      r