Who wears a helmet?
The umpire wears a helmet.
     src       edge_attr  dst
0      0  to the left of    2
1      0  to the left of   11
2      0  to the left of   21
3      0  to the left of   20
4      1  to the left of    8
..   ...             ...  ...
194   32  to the left of    2
195   32  to the left of   27
196   33  to the left of   12
197   33  to the left of    8
198   33  to the left of    9

[199 rows x 3 columns]