Are there either forks or plates?
No, there are no forks or plates.
    src        edge_attr  dst
0     4   to the left of   11
1     4   to the left of    9
2     5               on   11
3     5  to the right of   17
4     6   to the left of   14
5     7   to the left of   14
6     7  to the right of   16
7     9  to the right of    4
8     9  to the right of   13
9    11  to the right of    4
10   11  to the right of   13
11   13   to the left of    9
12   13   to the left of   11
13   14  to the right of    7
14   14  to the right of    6
15   16   to the left of    7
16   17   to the left of    5