/-98
  /-96
  | | /-91
  | | | |     /-87
  | | | |   /-84
  | | | | /-83
  | | | | | | /-80
  | | | | | | | \-79
  | | | | | | |   \-78
  | | | | | \-77
  | | | \-76
  | \-74
  |   \-73
  |     |     /-72
  |     |     | \-71
  |     |     |   \-67
  |     |   /-65
  |     |   | \-63
  |     | /-61
  |     | | \-59
  |     \-56
  |       | /-55
  |       | | | /-51
  |       | | \-47
  |       \-45
  |         |   /-43
  |         | /-42
  |         \-40
--39
  |         /-38
  |       /-36
  |       | \-34
  |     /-33
  |     | |     /-32
  |     | |   /-27
  |     | | /-25
  |     | \-23
  |     |   | /-22
  |     |   \-21
  |   /-18
  |   | | /-16
  |   | \-15
  |   |   \-13
  | /-9
  \-8
    | /-2
    \-1