Are there any fences or birds?
Yes, there is a bird.
   src        edge_attr  dst
0    1  to the right of    4
1    2   to the left of    3
2    2  to the right of    4
3    3  to the right of    2
4    4   to the left of    2
5    4   to the left of    1
6    4  to the right of    6
7    5  to the right of    6
8    6   to the left of    5
9    6   to the left of    4