Are there any tools or fences?
Yes, there is a fence.
    src        edge_attr  dst
0     0               on    1
1     0   to the left of   12
2     0  to the right of   17
3     1   to the left of   13
4     1  to the right of   14
..  ...              ...  ...
82   20   to the left of   13
83   20  to the right of   19
84   20  to the right of   14
85   20  to the right of    9
86   20   to the left of   12

[87 rows x 3 columns]