Which place is it?
It is a forest.
    src        edge_attr  dst
0     0  to the right of   19
1     0  to the right of   14
2     0   to the left of    7
3     0  to the right of    4
4     0   to the left of   12
..  ...              ...  ...
56   19   to the left of    0
57   19   to the left of   13
58   20  to the right of   17
59   20   to the left of    9
60   20   to the left of    6

[61 rows x 3 columns]