5
X-----------------------------------------------X
X                                               X
X                                               X
X           X            a                      X
X    R      X                                   X
X           X                  ------           X
X------------  -----                            X
X                                               X
X                             A                 X
X            A                                  X
X                                               X
X    --        X-----------------X              X
X              X       H         -      A       X
X              X   H       0                    X
X              X       1         X              X
X              X  0    2   H     X              X
X     A        X                 X              X
X              -       b         X              X
X                            0   X     --    A  X
X              X   0    H        X              X
X              X                 X              X
X              -------------------              X
X                                               X
X                                               X
X      A                              A         X
X                                               X
X                     ------                    X
X                                               X
X                                               X
X       -------                     X-----------X
X                                   X           X
X                                   X           X
X                      A            X     B     X
X         a                         X           X
X                                               X
X                                               X
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