What is that number on?
The number is on the hydrant.
    src        edge_attr  dst
0     0  to the right of    9
1     0  to the right of   12
2     0  to the right of    3
3     1  to the right of    3
4     1  to the right of    9
5     2               on    0
6     2  to the right of   12
7     2  to the right of    9
8     2  to the right of    3
9     3  to the right of    8
10    3  to the right of    6
11    3   to the left of    0
12    3   to the left of    2
13    3   to the left of    1
14    3   to the left of    9
15    4   to the left of    5
16    5   on the side of    3
17    5   to the left of   10
18    5  to the right of    4
19    5               on    3
20    5   to the left of    9
21    6   to the left of    3
22    6   to the left of    7
23    7  to the right of    8
24    7   to the left of    9
25    7  to the right of    6
26    8   on the side of   14
27    8   to the left of    3
28    8   to the left of    7
29    9  to the right of   10
30    9   to the left of    2
31    9  to the right of    7
32    9  to the right of    3
33    9  to the right of    5
34    9   to the left of    1
35    9   to the left of    0
36    9  to the right of   12
37   10     connected to    3
38   10  to the right of    5
39   10   to the left of    9
40   12   to the left of    0
41   12   to the left of    9
42   12   to the left of    2