Are there any locks or waste baskets?
No, there are no locks or waste baskets.
   src        edge_attr  dst
0    0               on    3
1    0   to the left of    1
2    0   to the left of    4
3    1  to the right of    2
4    1  to the right of    0
5    2   to the left of    1
6    2   to the left of    4
7    4  to the right of    2
8    4  to the right of    0