How clean is the ground?
The ground is dirty.
    src        edge_attr  dst
0     0   to the left of    5
1     2   to the left of    8
2     4  to the right of    8
3     5  to the right of    6
4     5  to the right of    0
5     5  to the right of    7
6     6   to the left of    5
7     7   to the left of    5
8     8   to the left of    4
9     8   to the left of    9
10    8  to the right of    2
11    9  to the right of    8