Does the ground look grassy?
No, the ground is rocky.
    src        edge_attr  dst
0     0   to the left of    1
1     1  to the right of    0
2     2  to the right of   15
3     2  to the right of    7
4     3  to the right of    4
5     3  to the right of   16
6     3  to the right of   12
7     4   to the left of    3
8     5  to the right of    6
9     6   to the left of    5
10    7   to the left of    2
11   12   to the left of    3
12   13         lying on   10
13   15   to the left of    2
14   16   to the left of    3