What vehicle is made of metal?
The vehicle is a car.
    src        edge_attr  dst
0     1   to the left of   10
1     2   to the left of    3
2     2      in front of   10
3     3  to the right of    5
4     3  to the right of    2
5     3  to the right of   11
6     3  to the right of    6
7     5   to the left of    3
8     5   to the left of   10
9     6   to the left of   10
10    6   to the left of    3
11    6  to the right of   11
12    7  to the right of    9
13    9   to the left of   10
14    9   to the left of    7
15   10  to the right of    1
16   10  to the right of    5
17   10  to the right of    6
18   10  to the right of    9
19   10           behind    2
20   11   to the left of    3
21   11   to the left of    6