What kind of vehicle is gray?
The vehicle is a car.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of    7
2     1   parked next to    6
3     2   to the left of    8
4     2  to the right of    6
5     5   to the left of    8
6     6   to the left of    8
7     6   to the left of    2
8     7  to the right of    9
9     7   to the left of    8
10    7  to the right of    0
11    8  to the right of    2
12    8  to the right of    5
13    8  to the right of    6
14    8  to the right of    7
15    9  to the right of    0
16    9   to the left of    7