Is the tree behind a horse?
No, the tree is behind the car.
   src        edge_attr  dst
0    0      in front of    6
1    1  to the right of    7
2    1   to the left of    3
3    2  to the right of    7
4    3  to the right of    1
5    6           behind    0
6    7   to the left of    1
7    7   to the left of    2