What is the fence made of, iron or stone?
The fence is made of iron.
     src        edge_attr  dst
0      0  to the right of   19
1      0  to the right of   29
2      0  to the right of   38
3      0  to the right of    7
4      0  to the right of   13
..   ...              ...  ...
237   41  to the right of   24
238   41  to the right of   39
239   41  to the right of   36
240   41  to the right of   11
241   41   to the left of    0

[242 rows x 3 columns]