What kind of aircraft is to the right of the truck?
The aircraft is airplanes.
    src        edge_attr  dst
0     0            above    4
1     1  to the right of    8
2     1  to the right of   15
3     1  to the right of   12
4     2   to the left of    6
5     2   to the left of   12
6     2   to the left of   10
7     3               on    7
8     3           behind   12
9     3  to the right of    9
10    3   to the left of   15
11    5   to the left of   15
12    5  to the right of    9
13    5   to the left of   13
14    6  to the right of    2
15    6  to the right of   10
16    7  to the right of    9
17    8  to the right of    9
18    8   to the left of    1
19    8   to the left of   15
20    8  to the right of   14
21    9               on    7
22    9   to the left of    8
23    9   to the left of    7
24    9   to the left of    5
25    9   to the left of   13
26    9   to the left of    3
27   10  to the right of    2
28   10   to the left of    6
29   10   to the left of   12
30   11   to the left of   12
31   12  to the right of   11
32   12   to the left of   15
33   12      in front of    3
34   12   to the left of    1
35   12  to the right of    2
36   12  to the right of   10
37   13  to the right of    9
38   13  to the right of    5
39   13   to the left of   15
40   14   to the left of    8
41   15               at    4
42   15  to the right of    3
43   15               on    7
44   15  to the right of    5
45   15   to the left of    1
46   15  to the right of   12
47   15  to the right of    8
48   15  to the right of   13