Is the fork on the left?
No, the fork is on the right of the image.
    src        edge_attr  dst
0     1   to the left of    2
1     2  to the right of   11
2     2  to the right of   13
3     2  to the right of    1
4     3  to the right of    4
5     4   to the left of    3
6     7   to the left of   12
7     8               on    6
8     9               on    6
9    10  to the right of   12
10   11   to the left of    2
11   12   to the left of   10
12   12  to the right of    7
13   12  to the right of   13
14   13   to the left of   12
15   13   to the left of    2