What is leaning on the fence?
The fans are leaning on the fence.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of   13
2     0  to the right of   10
3     0  to the right of    5
4     0  to the right of    9
5     0  to the right of   14
6     0  to the right of    8
7     3  to the right of   13
8     5   to the left of    8
9     5   to the left of   11
10    5   to the left of    0
11    5   to the left of   12
12    5   to the left of   15
13    5   to the left of    6
14    6  to the right of    5
15    6  to the right of   14
16    7   to the left of    0
17    7   to the left of   15
18    8  to the right of    9
19    8  to the right of    5
20    8   to the left of    0
21    8  to the right of   13
22    9   to the left of    8
23    9   to the left of    0
24    9  to the right of   13
25   10   to the left of    0
26   11  to the right of    5
27   12  to the right of   14
28   12  to the right of    5
29   13   to the left of    9
30   13   to the left of    8
31   13   to the left of    3
32   13   to the left of    0
33   13       leaning on    1
34   14   to the left of    6
35   14   to the left of    0
36   14   to the left of   12
37   14   to the left of   15
38   15  to the right of    7
39   15  to the right of    5
40   15  to the right of   14