What vehicle is in front of the green tree?
The vehicle is a bus.
    src        edge_attr  dst
0     1   to the left of    8
1     1  to the right of   10
2     1   to the left of    6
3     2  to the right of   10
4     2   to the left of    8
5     2  to the right of    7
6     2   to the left of    6
7     4           behind   10
8     4  to the right of    9
9     4               on   11
10    5   to the left of    6
11    5  to the right of   10
12    5   to the left of    8
13    6  to the right of    1
14    6  to the right of    2
15    6  to the right of    5
16    6  to the right of   10
17    6  to the right of    8
18    7   to the left of    2
19    7  to the right of    9
20    8  to the right of    2
21    8  to the right of    5
22    8  to the right of    1
23    8   to the left of    6
24    8  to the right of   10
25    9   to the left of    7
26    9   to the left of   10
27    9   to the left of   12
28    9           behind   10
29    9   to the left of    4
30   10      in front of    9
31   10      in front of    4
32   10   to the left of    8
33   10   to the left of    5
34   10   to the left of    1
35   10   to the left of    6
36   10   to the left of    2
37   10  to the right of    9
38   10      parked near   11
39   12  to the right of    9