.
                                     B
                             r      re      r
                           e        at         e
                          a          h           a
                         t          B  r            t
                        h         e     a          h
                        B         t      h          B
                         r         B    r            r
                          e         e   a           e
                            a        t h          a
                                t      ●        t
                                       H