Who is riding?
The people are riding.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    2
2     0   to the left of    1
3     0   to the left of    6
4     0   to the left of    3
5     1  to the right of    0
6     1   to the left of    5
7     2  to the right of    0
8     2  to the right of    8
9     3  to the right of    0
10    5  to the right of    1
11    5  to the right of    6
12    6  to the right of    0
13    6   to the left of    5
14    7  to the right of    0
15    8   to the left of    2