What is in front of the field?
The fence is in front of the field.
     src        edge_attr  dst
0      1   to the left of   28
1      1  to the right of   26
2      1      in front of   26
3      1   to the left of   14
4      1   to the left of    3
..   ...              ...  ...
134   28  to the right of    1
135   28  to the right of   26
136   28   to the left of   27
137   28   to the left of   18
138   29  to the right of   26

[139 rows x 3 columns]