How clean is the bowl of the toilet?
The bowl is dirty.
    src        edge_attr  dst
0     0   to the left of    3
1     1               of   10
2     3  to the right of    7
3     3  to the right of   10
4     3  to the right of    6
5     3  to the right of    0
6     3  to the right of    4
7     4   to the left of    3
8     4   to the left of    6
9     6  to the right of    7
10    6               on    0
11    6   to the left of    3
12    6  to the right of    4
13    7   to the left of    6
14    7               of   10
15    7   to the left of    3
16    8               of   10
17   10   to the left of    3