What's the airplane in front of?
The airplane is in front of the hills.
    src        edge_attr  dst
0     1  to the right of    9
1     2   to the left of    9
2     4   to the left of    9
3     5           behind   11
4     7            below   11
5     7            under   11
6     7               on    6
7     8            below   11
8     9  to the right of    4
9     9  to the right of    2
10    9   to the left of    1
11   11      in front of    5
12   11            above    7