Which color is the sky?
The sky is dark.
    src        edge_attr  dst
0     0            below    2
1     2            below    3
2     2            above    0
3     2           flying    3
4     2               in    0
5     2   to the left of    6
6     2               on    0
7     2  to the right of    5
8     3            above    2
9     3               in    1
10    4   to the left of    6
11    5   to the left of    7
12    5   to the left of    2
13    6  to the right of    2
14    6  to the right of    4
15    7  to the right of    5