What is the clock on?
The clock is on the post.
     src        edge_attr  dst
0      0  to the right of    3
1      0   to the left of    1
2      0  to the right of   25
3      0  to the right of   12
4      0  to the right of    7
..   ...              ...  ...
133   28   to the left of    7
134   28   to the left of   14
135   28   to the left of   17
136   28   to the left of   15
137   29   to the left of   12

[138 rows x 3 columns]