Is the sky blue or black?
The sky is black.
   src        edge_attr  dst
0    0   to the left of    2
1    1  to the right of    2
2    2   to the left of    7
3    2   to the left of    1
4    2  to the right of    0
5    4               on    5
6    7  to the right of    8
7    7  to the right of    2
8    8               on    1
9    8   to the left of    7