What kind of vehicle is to the right of the vehicle on the left?
The vehicle is a bus.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    5
2     1  to the right of    7
3     1   to the left of    5
4     1               of   11
5     1   to the left of   10
6     2   to the left of    9
7     2  to the right of    6
8     2   to the left of    5
9     2   to the left of    3
10    3  to the right of    2
11    3  to the right of    9
12    3  to the right of    0
13    3  to the right of   11
14    3  to the right of    6
15    5  to the right of    6
16    5  to the right of    9
17    5  to the right of    8
18    5  to the right of   11
19    5  to the right of    2
20    5  to the right of    1
21    5  to the right of    0
22    6   to the left of    2
23    6   to the left of    3
24    6   to the left of    5
25    6  to the right of    7
26    6   to the left of    9
27    7   to the left of    6
28    7   to the left of   11
29    7   to the left of    1
30    7           beside   11
31    8   to the left of    5
32    9  to the right of    2
33    9   to the left of    3
34    9  to the right of    6
35    9   to the left of    5
36   10  to the right of    1
37   10  to the right of   11
38   11       driving on    4
39   11   to the left of   10
40   11   to the left of    3
41   11   to the left of    5
42   11  to the right of    7