What is on the pole?
The clock is on the pole.
    src        edge_attr  dst
0     1               in    0
1     4  to the right of   12
2     4  to the right of    7
3     5               in    0
4     5   to the left of    7
5     6  to the right of   12
6     7  to the right of    5
7     7   to the left of    4
8     7   to the left of   13
9    12   to the left of    6
10   12   to the left of    4
11   12               on    7
12   13  to the right of    7