Who is wearing a uniform?
The policeman is wearing a uniform.
     src        edge_attr  dst
0      0   to the left of    6
1      0  to the right of    4
2      0   to the left of    9
3      1  to the right of    2
4      2   to the left of    1
..   ...              ...  ...
96    22  to the right of   12
97    22   to the left of   16
98    22   to the left of   17
99    22   to the left of   20
100   22   to the left of   21

[101 rows x 3 columns]