What is common to the flower and the wall?
The color, both the flower and the wall are green.
   src        edge_attr  dst
0    0   to the left of    5
1    1  to the right of    4
2    3               in    0
3    3  to the right of    4
4    4               in    0
5    4   to the left of    1
6    4   to the left of    3
7    5  to the right of    0