What is the helmet on?
The helmet is on the bike.
    src        edge_attr  dst
0     0           behind    2
1     1            below    2
2     1  to the right of    3
3     1  to the right of    2
4     2             near    3
5     2               on    1
6     2      in front of    0
7     2   to the left of    1
8     3               on    2
9     3             near    2
10    3   to the left of    1