Do you see either clocks or lamps there?
No, there are no clocks or lamps.
    src        edge_attr  dst
0     0  to the right of   15
1     1  to the right of   15
2     1  to the right of    8
3     2   to the left of   16
4     2   to the left of    8
..  ...              ...  ...
57   22  to the right of   18
58   23   to the left of   21
59   23  to the right of   18
60   23  to the right of   17
61   23   to the left of    6

[62 rows x 3 columns]