Who is wearing knee pads?
The boy is wearing knee pads.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   11
2     0  to the right of   21
3     0  to the right of   20
4     0  to the right of   14
..  ...              ...  ...
82   21   to the left of   20
83   21   to the left of    0
84   21   to the left of    3
85   23   to the left of    7
86   24   to the left of    0

[87 rows x 3 columns]