Are there any fences?
Yes, there is a fence.
     src        edge_attr  dst
0      0   to the left of    6
1      1   to the left of    5
2      1   to the left of    4
3      1   to the left of   13
4      1  to the right of   12
..   ...              ...  ...
130   39   to the left of   40
131   40   to the left of   38
132   40  to the right of   39
133   40   to the left of   17
134   40   to the left of   14

[135 rows x 3 columns]