      ·            ·      ︾   ·            ︽    ·                            ·    ·            ·        ·   ·       ·      ·                                                      ·                  ·             ·      ·          ·             ·           ·                  ·      ·          ·                           ·     ·                       ·           ·   ·       ·               ·        ·                ·      ·                   ·                           30              ·          ·         ·                                        ·            ·        ·                                     ·       ·                                              ·                               ·   ·      ·                  ·    ·                       ︾            · ︽       ·       ·                      ·        ·                                      ·                                     (   )          —    61                 6   28   ·  