Are there clocks at the station?
Yes, there is a clock at the station.
     src        edge_attr  dst
0      0  to the right of   16
1      0  to the right of    2
2      1  to the right of    7
3      1  to the right of    9
4      1   to the left of    2
..   ...              ...  ...
133   18   to the left of   19
134   18  to the right of    5
135   19   to the left of    3
136   19  to the right of   18
137   19  to the right of   16

[138 rows x 3 columns]