On which side is the fence?
The fence is on the left of the image.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of   10
2     0   to the left of    2
3     0   to the left of    1
4     0   to the left of    9
..  ...              ...  ...
80   23   to the left of   21
81   23   to the left of   11
82   23   to the left of   13
83   23   to the left of    4
84   23  to the right of    6

[85 rows x 3 columns]