What is under the airplane?
The truck is under the plane.
    src        edge_attr  dst
0     0           beside    9
1     0         close to    9
2     0            below    2
3     0            below    9
4     0   to the left of    3
5     0   to the left of    8
6     1            under    9
7     1            below    9
8     1            below    2
9     1   to the left of    8
10    2            above    9
11    3  to the right of    8
12    3   to the left of    5
13    3  to the right of    0
14    4   to the left of   10
15    5  to the right of    3
16    5  to the right of    8
17    6               on    4
18    8   to the left of    3
19    8  to the right of    1
20    8   to the left of    5
21    8  to the right of    0
22    9            above    1
23    9            above    0
24    9           beside    0
25    9               in    2
26   10  to the right of    4