Who is on the platform?
The boy is on the platform.
    src       edge_attr  dst
0     0  to the left of   12
1     0  to the left of   17
2     0  to the left of   16
3     0  to the left of    5
4     0  to the left of    4
..  ...             ...  ...
73   20  to the left of   17
74   20  to the left of    8
75   20  to the left of   15
76   20  to the left of   12
77   20  to the left of   16

[78 rows x 3 columns]