Are there either balls or fences?
No, there are no balls or fences.
    src       edge_attr  dst
0     0  to the left of   15
1     0  to the left of    5
2     0  to the left of    6
3     2  to the left of    5
4     2  to the left of    6
..  ...             ...  ...
61   16  to the left of    4
62   16  to the left of   15
63   16  to the left of    9
64   16  to the left of    7
65   16  to the left of    5

[66 rows x 3 columns]