Is there either any brown grass or sand?
Yes, there is brown grass.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of    4
2     2  to the right of   12
3     3      standing in    5
4     3      in front of   12
5     4           eating   11
6     4  to the right of    0
7     4  to the right of    6
8     6   to the left of    4
9     6   to the left of    9
10    9  to the right of    0
11    9  to the right of    6
12   12           behind    3
13   12   to the left of    2