Are the clouds white or blue?
The clouds are blue.
   src        edge_attr  dst
0    0   to the left of    9
1    0   to the left of   10
2    2  to the right of    4
3    2  to the right of    3
4    3   to the left of    2
5    4   to the left of    2
6    6               in    7
7    9  to the right of    0
8   10  to the right of    0