How clean is the ground that is brown?
The ground is dirty.
    src        edge_attr  dst
0     0   to the left of    6
1     1           behind    4
2     1  to the right of    7
3     4          next to    8
4     4           behind    7
5     4           behind    8
6     4             near    8
7     6  to the right of    0
8     6  to the right of    7
9     7   to the left of    6
10    7   to the left of    1
11    7      in front of    4
12    7               on    8
13    8      in front of    4
14    8             near    4