Is the high fence in front of the trees?
Yes, the fence is in front of the trees.
   src        edge_attr  dst
0    3           behind   12
1    3      in front of    4
2    4           behind    3
3    5   to the left of    6
4    5  to the right of   14
5    6  to the right of    5
6   12          wearing    9
7   12      in front of    3
8   14   to the left of    5