Do you see any brown mud or grass?
No, there is grass but it is green.
   src        edge_attr  dst
0    0   to the left of    2
1    0   to the left of    1
2    0  to the right of    3
3    1  to the right of    3
4    1  to the right of    0
5    2  to the right of    0
6    2  to the right of    3
7    3   to the left of    0
8    3   to the left of    2
9    3   to the left of    1