What are the flowers growing behind of?
The flowers are growing behind the toilet.
   src        edge_attr  dst
0    0   to the left of    2
1    0   to the left of    3
2    1   to the left of    2
3    2  to the right of    0
4    2  to the right of    1
5    3  to the right of    0
6    3   growing behind    1