What material is the fence, iron or stone?
The fence is made of iron.
    src        edge_attr  dst
0     1   to the left of   18
1     1   to the left of   15
2     2               in    0
3     3  to the right of    8
4     3  to the right of    7
..  ...              ...  ...
91   24   to the left of   15
92   24  to the right of   19
93   24   to the left of   18
94   24   to the left of   22
95   24  to the right of   21

[96 rows x 3 columns]