                                                      [1/2]
                                                    /       \
                                              [1/4]         [3/4]
                                            /
                                      [1/8]
                                    /
                               [1/16]
                             /        \
                       [1/32]         [3/32]
                     /              /        \
                [1/64]         [5/64]        [7/64]
              /        \
        [1/128]        [3/128]
      /
[1/256]
