Who is walking?
The people are walking.
    src        edge_attr  dst
0     0        on top of   13
1     1        on top of   13
2     1   to the left of    4
3     1   to the left of    3
4     2  to the right of   12
5     2   to the left of    6
6     2        on top of   15
7     2      in front of   14
8     3  to the right of    1
9     4        on top of   15
10    4  to the right of    1
11    5   to the left of    6
12    5  to the right of    9
13    6  to the right of    2
14    6  to the right of    5
15    6   to the left of    7
16    7        on top of   15
17    7  to the right of    6
18    9  to the right of   11
19    9   to the left of    5
20   11               in    9
21   11   to the left of    9
22   12   to the left of    2
23   14           behind    2