Is there any grass or sand that is brown?
Yes, the grass is brown.
    src        edge_attr  dst
0     0   to the left of    4
1     1   to the left of    4
2     1   to the left of    2
3     2  to the right of    1
4     2  to the right of   10
5     3  to the right of   16
6     3   to the left of    8
7     4  to the right of    9
8     4  to the right of    0
9     4  to the right of   10
10    4  to the right of    1
11    5  to the right of   12
12    7  to the right of   12
13    8  to the right of    3
14    9   to the left of    4
15   10   to the left of    4
16   10   to the left of    2
17   12   to the left of    5
18   12   to the left of    7
19   16   to the left of    3