What color is the ground?
The ground is green.
    src        edge_attr  dst
0     1  to the right of   13
1     1  to the right of    2
2     2   to the left of    3
3     2   to the left of    1
4     2  to the right of   12
..  ...              ...  ...
61   22   to the left of   20
62   23   to the left of   20
63   23   to the left of    9
64   24   to the left of   20
65   25   to the left of   12

[66 rows x 3 columns]