What do the sheep and the dog have in common?
The color, both the sheep and the dog are white.
   src        edge_attr  dst
0    2           beside    0
1    2       covered in    3
2    3  to the right of    4
3    4           beside    0
4    4          herding    5
5    4   to the left of    3
6    5               in    2
7    5           beside    0
8    5      standing in    3