Which kind of vehicle in the image is gray?
The vehicle is a SUV.
    src        edge_attr  dst
0     1               on    3
1     2          next to    3
2     2  to the right of   11
3     2             near    3
4     2  to the right of    4
5     3             near    4
6     3          next to    4
7     3             near    2
8     4             near    3
9     4               on    7
10    4            below    6
11    4      in front of    9
12    4          next to    3
13    4   to the left of    2
14    5  to the right of    9
15    6            above    7
16    6            above    4
17    6   to the left of   13
18    9   to the left of    5
19    9           behind    4
20   11   to the left of    2
21   13  to the right of    6