Are there either any cats or cows that are white?
Yes, the cat is white.
   src        edge_attr  dst
0    1               of    4
1    1   to the left of    6
2    2   to the left of    4
3    2   to the left of    6
4    4  to the right of    2
5    6  to the right of    2
6    6  to the right of    1