What is the number on?
The number is on the post.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of   10
2     0   to the left of   12
3     0   to the left of    3
4     0   to the left of    2
5     0   to the left of    5
6     2   to the left of    4
7     2   to the left of    9
8     2   to the left of   11
9     2  to the right of    0
10    3  to the right of    0
11    3   to the left of    4
12    3   to the left of    9
13    4  to the right of    3
14    4  to the right of   10
15    4  to the right of    2
16    4   to the left of   11
17    4  to the right of   12
18    4   to the left of    8
19    4  to the right of    9
20    4               on    9
21    5   to the left of    7
22    5  to the right of    0
23    6   to the left of   11
24    6   to the left of    8
25    7  to the right of    0
26    7  to the right of    5
27    8  to the right of    6
28    8  to the right of    4
29    8  to the right of    9
30    8  to the right of   10
31    8               on   11
32    9   to the left of   11
33    9   to the left of    8
34    9  to the right of   10
35    9   to the left of    4
36    9  to the right of    3
37    9  to the right of    2
38   10  to the right of    0
39   10   to the left of    8
40   10   to the left of    9
41   10   to the left of    4
42   10   to the left of   11
43   11  to the right of    2
44   11  to the right of    9
45   11  to the right of   10
46   11  to the right of    6
47   11  to the right of    4
48   12   to the left of    4
49   12  to the right of    0