What is the sign on?
The sign is on the fire hydrant.
    src        edge_attr  dst
0     0  to the right of    8
1     0  to the right of    6
2     2               on    1
3     4   to the left of    8
4     4  to the right of    7
5     5               on    4
6     6  to the right of    7
7     6   to the left of    0
8     6   to the left of    8
9     7   to the left of    6
10    7   to the left of   12
11    7               on    1
12    7   to the left of    4
13    8   to the left of    0
14    8  to the right of    4
15    8  to the right of    6
16    9               in    1
17    9  to the right of   12
18   10               on   12
19   12  to the right of    7
20   12   to the left of    9