What is the vehicle that is covered by the grass called?
The vehicle is a car.
    src        edge_attr  dst
0     1   to the left of   10
1     1   to the left of    2
2     1   to the left of    8
3     1   to the left of   13
4     1               in   11
5     2       covered by   13
6     2  to the right of    1
7     4   to the left of    9
8     5   to the left of   15
9     5   to the left of   17
10    7   to the left of   12
11    8   to the left of   16
12    8  to the right of    1
13    9  to the right of    4
14   10   to the left of   17
15   10   to the left of   16
16   10   to the left of   15
17   10          holding    8
18   10   to the left of   12
19   10  to the right of    1
20   12  to the right of   10
21   12  to the right of    7
22   13  to the right of    1
23   15  to the right of   10
24   15  to the right of    5
25   16  to the right of   10
26   16  to the right of    8
27   16          holding   17
28   17  to the right of    5
29   17               in    0
30   17  to the right of   10