The sky has which color?
The sky is dark.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of    9
2     3   to the left of   10
3     3   to the left of    9
4     5  to the right of    7
5     6               on    9
6     7   to the left of    9
7     7   to the left of    5
8     9  to the right of    0
9     9  to the right of    3
10    9  to the right of    7
11    9  to the right of   11
12   10  to the right of   11
13   10  to the right of    3
14   10  to the right of    0
15   11   to the left of   10
16   11   to the left of    9