Does the ground look green and smooth?
No, the ground is smooth but white.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    3
2     1   to the left of    5
3     1   to the left of    3
4     1   to the left of    6
5     3  to the right of    7
6     3  to the right of    1
7     3  to the right of    0
8     4               by    6
9     5  to the right of    7
10    5  to the right of    1
11    6  to the right of    1
12    6  to the right of    0
13    7   to the left of    3
14    7   to the left of    5
15    9  to the right of   10
16   10   to the left of    9
17   10  to the right of   11
18   11   to the left of   10