Which color is the sky?
The sky is blue.
    src        edge_attr  dst
0     0   to the left of   10
1     1  to the right of    6
2     1   to the left of    5
3     5  to the right of    1
4     6  to the right of    9
5     6   to the left of    1
6     8  to the right of   10
7     9   to the left of    6
8    10  to the right of    0
9    10   to the left of    8
10   11               on    1