Which kind of vehicle is to the right of the backpack?
The vehicle is a car.
    src        edge_attr  dst
0     0             near    2
1     0             near    3
2     0          next to    3
3     0          wearing    4
4     0       walking on    2
5     0   to the left of    3
6     1               on    2
7     1          next to    3
8     1             near    3
9     1            below    3
10    1   to the left of    3
11    2             near    3
12    2             near    0
13    3               on    2
14    3             near    1
15    3             near    0
16    3             near    2
17    3  to the right of    6
18    3  to the right of    4
19    3  to the right of    1
20    3  to the right of    0
21    4   to the left of    3
22    6   to the left of    3