Is there either any grass or sand that is not brown?
No, there is grass but it is brown.
    src        edge_attr  dst
0     0  to the right of    5
1     1   to the left of   11
2     1  to the right of    5
3     1   to the left of    4
4     3   to the left of    9
5     4  to the right of    1
6     5   to the left of    0
7     5   to the left of    1
8     5   to the left of   12
9     9  to the right of    3
10   11  to the right of    1
11   12  to the right of    5