Are there either lamps or fences?
Yes, there is a fence.
    src        edge_attr  dst
0     0  to the right of    4
1     1  to the right of    4
2     2   to the left of   17
3     2   to the left of   15
4     2   to the left of   12
..  ...              ...  ...
70   22  to the right of   13
71   22  to the right of   23
72   23   to the left of   22
73   23   to the left of   17
74   23   to the left of   18

[75 rows x 3 columns]