Are there either cows or dogs?
No, there are no cows or dogs.
   src        edge_attr  dst
0    0   to the left of   12
1    2   to the left of    5
2    5  to the right of    2
3   10  to the right of   11
4   10  to the right of   14
5   11  to the right of   14
6   11   to the left of   10
7   12  to the right of    0
8   14   to the left of   11
9   14   to the left of   10