Is the sky cloudy and blue?
No, the sky is blue but clear.
   src        edge_attr  dst
0    1  to the right of    4
1    1  to the right of    2
2    1   to the left of    6
3    2               on    1
4    2   to the left of    1
5    4   to the left of    1
6    4               on    2
7    6  to the right of    1
8    8               on    2
9    8        on top of    2