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   16
1     0  to the right of   14
2     1   to the left of    7
3     1   to the left of    5
4     1   to the left of   14
..  ...              ...  ...
76   20  to the right of   13
77   20   to the left of   14
78   21  to the right of   13
79   21   to the left of   18
80   21   to the left of   14

[81 rows x 3 columns]