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