Is there either any sand or grass that is not brown?
No, there is grass but it is brown.
    src        edge_attr  dst
0     1   to the left of   15
1     1  to the right of   11
2     1   to the left of   13
3     1   to the left of   12
4     1  to the right of    4
..  ...              ...  ...
82   24   to the left of   13
83   24  to the right of   11
84   24   to the left of   16
85   24  to the right of    2
86   24   to the left of   15

[87 rows x 3 columns]