Do you see any panda bears or books?
Yes, there is a panda bear.
   src        edge_attr  dst
0    0               of    2
1    1  to the right of    2
2    1  to the right of    3
3    2   to the left of    1
4    2   to the left of    3
5    3   to the left of    1
6    3  to the right of    2