Who is standing behind the motorcycles?
The men are standing behind the motorcycles.
    src        edge_attr  dst
0     1  to the right of   11
1     2  to the right of   11
2     3   to the left of    6
3     3   to the left of    5
4     3   to the left of   14
5     3   to the left of   11
6     5  to the right of    3
7     6   to the left of   15
8     6   to the left of   14
9     6  to the right of    3
10    8  to the right of   12
11    8  to the right of    9
12    9   to the left of    8
13   10   to the left of   14
14   11   to the left of    1
15   11  standing behind   12
16   11  to the right of    3
17   11   to the left of    2
18   12               on    4
19   12               in    3
20   12      in front of    4
21   12   to the left of    8
22   14  to the right of   10
23   14  to the right of    6
24   14  to the right of    3
25   15  to the right of    6