Who is riding a motorcycle?
The policeman is riding a motorcycle.
     src        edge_attr  dst
0      0   to the left of    3
1      0   to the left of   24
2      0   to the left of   15
3      0   to the left of   13
4      0   to the left of   25
..   ...              ...  ...
135   25               by   24
136   25               on   13
137   25  to the right of   10
138   25  to the right of    0
139   25  to the right of    5

[140 rows x 3 columns]