What is under the tree?
The sign is under the tree.
    src        edge_attr  dst
0     0   to the left of   14
1     0  to the right of    6
2     0   to the left of    5
3     0  to the right of    4
4     0   to the left of   13
..  ...              ...  ...
66   17   to the left of   11
67   17            under    8
68   18   to the left of   12
69   18               on   17
70   18  to the right of    1

[71 rows x 3 columns]