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