Is the weather clear today?
Yes, it is clear.
   src        edge_attr  dst
0    1               of    0
1    1  to the right of    3
2    2               in    6
3    2   to the left of    4
4    3               of    0
5    3   to the left of    1
6    4  to the right of    2
7    5               of    0
8    7               in    6