What is the clock on?
The clock is on the clock tower.
     src        edge_attr  dst
0      1   to the left of   18
1      1  to the right of   16
2      1  to the right of   10
3      2   to the left of   19
4      2   to the left of   18
..   ...              ...  ...
120   20   to the left of   15
121   20  to the right of   10
122   20  to the right of   14
123   20  to the right of   16
124   20   to the left of   18

[125 rows x 3 columns]