How does the grass look like, bare or covered?
The grass is covered.
    src        edge_attr  dst
0     0   to the left of    4
1     1  to the right of    2
2     2   to the left of    1
3     2   to the left of   14
4     4  to the right of    0
5     6               on    7
6     6   to the left of   10
7     6   to the left of   14
8    10  to the right of    6
9    14  to the right of    2
10   14  to the right of    6