What's on the post?
The sign is on the post.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    4
2     0  to the right of    5
3     0  to the right of    2
4     0  to the right of    3
5     1  to the right of    2
6     1  to the right of    4
7     1  to the right of    6
8     2   to the left of    0
9     2   to the left of    1
10    2   to the left of    7
11    3   to the left of    0
12    3   to the left of    7
13    3               on    9
14    3   to the left of    6
15    4   to the left of    0
16    4   to the left of    1
17    5       hanging on    6
18    5   to the left of    0
19    6  to the right of    3
20    6   to the left of    1
21    6   to the left of    0
22    7  to the right of    9
23    7  to the right of    3
24    7  to the right of    2
25    9   to the left of    7
26   10               on    4