Is there any brown grass?
Yes, there is brown grass.
    src        edge_attr  dst
0     1   to the left of    7
1     1   to the left of   13
2     2   to the left of   12
3     2   to the left of    8
4     2   to the left of   14
5     3   to the left of    5
6     4   to the left of    9
7     5  to the right of    3
8     6   to the left of   16
9     7  to the right of    1
10    7  to the right of   13
11    8  to the right of   12
12    8  to the right of    2
13    9   to the left of   17
14    9  to the right of    4
15   10  to the right of   11
16   10   to the left of   13
17   11   to the left of   13
18   11   to the left of   10
19   12   to the left of    8
20   12  to the right of    2
21   12   to the left of   14
22   13  to the right of   11
23   13  to the right of    1
24   13  to the right of   10
25   13   to the left of    7
26   14  to the right of    2
27   14  to the right of   12
28   16  to the right of    6
29   16  to the right of   21
30   17  to the right of    9
31   19  to the right of   20
32   20   to the left of   22
33   20   to the left of   19
34   21   to the left of   16
35   22  to the right of   20