Is there a metal fence?
No, there is a fence but it is made of wood.
    src        edge_attr  dst
0     0  to the right of   23
1     0   to the left of    5
2     1           behind   22
3     2   to the left of   13
4     3  to the right of   24
..  ...              ...  ...
79   24   to the left of    4
80   26           behind   20
81   26           behind   22
82   26   to the left of   20
83   26   to the left of   14

[84 rows x 3 columns]