What is located on top of the dirt?
The plants are on top of the dirt.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of   14
2     0  to the right of   11
3     1   to the left of    9
4     1   to the left of    0
5     1   to the left of    3
6     1   to the left of   11
7     1             near   14
8     2               of   14
9     3   to the left of    9
10    3  to the right of    1
11    4               of   14
12    5               of   14
13    6               in   17
14    6  to the right of   10
15    7               of   14
16    9  to the right of   14
17    9  to the right of    1
18    9  to the right of    3
19    9  to the right of   11
20   10   to the left of    6
21   10  to the right of   11
22   10  to the right of   14
23   11   to the left of    0
24   11        on top of    0
25   11   to the left of    9
26   11   to the left of   10
27   11  to the right of    1
28   12      in front of   16
29   14  standing behind    1
30   14               in   17
31   14   to the left of   10
32   14             near    1
33   14   to the left of    9
34   14   to the left of    0
35   15               of   14
36   16           behind   12