Which kind of vehicle is below the sky?
The vehicle is a truck.
    src        edge_attr  dst
0     0            below    2
1     0             near    7
2     0             near    5
3     1             near    7
4     4   to the left of    6
5     5             near    7
6     5             near    0
7     6             near    7
8     6  to the right of    4
9     7             near    0
10    7             near    1
11    7             near    6
12    7             near    5