Which kind of vehicle is to the right of the oak tree?
The vehicle is a van.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of   11
2     0   to the left of    3
3     1   to the left of    4
4     1  to the right of    6
5     2   to the left of   17
6     3   to the left of    4
7     3  to the right of    0
8     3  to the right of   11
9     3   to the left of    9
10    3   to the left of   17
11    4  to the right of   15
12    4   to the left of   18
13    4  to the right of    1
14    4  to the right of    5
15    4  to the right of    3
16    4  to the right of   10
17    4  to the right of   11
18    5   to the left of    4
19    5   to the left of    7
20    5  to the right of   11
21    5   to the left of   12
22    5  to the right of   15
23    6   to the left of   11
24    6   to the left of    1
25    7  to the right of    5
26    7   to the left of   12
27    7  to the right of   11
28    8             near   10
29    9  to the right of   11
30    9  to the right of    3
31    9   to the left of   17
32    9  to the right of   15
33   10             near    8
34   10   to the left of    4
35   11   to the left of    9
36   11  to the right of    6
37   11   to the left of    4
38   11   to the left of    3
39   11  to the right of    0
40   11   to the left of    5
41   11   to the left of    7
42   12  to the right of    7
43   12  to the right of    5
44   15  to the right of    0
45   15   to the left of    5
46   15   to the left of    4
47   15   to the left of    9
48   17  to the right of    9
49   17   to the left of   18
50   17  to the right of    2
51   17  to the right of    3
52   18  to the right of    4
53   18  to the right of   17