What is parked on the gravel?
The car is parked on the gravel.
    src        edge_attr  dst
0     0  to the right of   14
1     2  to the right of    7
2     2  to the right of   14
3     5   to the left of   16
4     5   to the left of    9
5     6   to the left of   14
6     7        on top of   14
7     7   to the left of    2
8     8  to the right of   12
9     9  to the right of   10
10    9  to the right of    5
11    9  to the right of   16
12   10   to the left of    9
13   12   to the left of    8
14   14        parked on   15
15   14        parked on    6
16   14   to the left of    2
17   14   to the left of    0
18   14  to the right of    6
19   14   to the left of   15
20   15  to the right of   14
21   16               on    5
22   16   to the left of    9
23   16  to the right of    5