Are there both flags and fences in the scene?
Yes, there are both a flag and a fence.
    src        edge_attr  dst
0     1   to the left of    2
1     2  to the right of    7
2     2  to the right of    4
3     2  to the right of    1
4     2  to the right of   11
5     2  to the right of    9
6     2  to the right of    3
7     3   to the left of    7
8     3   to the left of    4
9     3   to the left of    2
10    4   to the left of    2
11    4  to the right of    3
12    4  to the right of    7
13    5   to the left of    6
14    6  to the right of    5
15    7   to the left of    4
16    7   to the left of    2
17    7  to the right of    3
18    8      in front of   10
19    9   to the left of    2
20   10           behind    8
21   11       wrapped in    9
22   11   to the left of    2