Who is running?
The people are running.
    src        edge_attr  dst
0     0  to the right of   12
1     1   to the left of   12
2     1   to the left of   10
3     2  to the right of   12
4     4  to the right of    9
5     4  to the right of   12
6     5  to the right of   13
7     5  to the right of   12
8     5  to the right of    6
9     6   to the left of    5
10    6   to the left of   13
11    9   to the left of    4
12   10  to the right of    1
13   12   to the left of    0
14   12  to the right of    1
15   12   to the left of    4
16   12   to the left of    5
17   12   to the left of    2
18   13  to the right of    6
19   13   to the left of    5