What color do you think is the hydrant?
The hydrant is white.
    src        edge_attr  dst
0     1   to the left of    6
1     2   to the left of    6
2     2   to the left of    7
3     3   to the left of    6
4     3   to the left of    7
5     5   to the left of    6
6     5   to the left of    7
7     6  to the right of    2
8     6  to the right of    5
9     6  to the right of    3
10    6  to the right of    8
11    6  to the right of    1
12    7  to the right of    2
13    7  to the right of    8
14    7  to the right of    3
15    7  to the right of    5
16    7   to the left of   12
17    8   to the left of    6
18    8               of    2
19    8   to the left of    7
20   12  to the right of    7