What is in front of the airplane?
The fence is in front of the plane.
   src        edge_attr  dst
0    1  to the right of    9
1    2           behind    3
2    2      in front of   10
3    2               on    5
4    3      in front of    2
5    7               in    0
6    8   to the left of   10
7    9   to the left of    1
8   10  to the right of    8