Are there either any black kites or buckets?
Yes, there is a black kite.
   src        edge_attr  dst
0    0   to the left of    2
1    1   to the left of    4
2    1   to the left of    5
3    2  to the right of    3
4    2  to the right of    0
5    3   to the left of    2
6    4  to the right of    1
7    5  to the right of    1