Is the sky stormy or cloudless?
The sky is cloudless.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of   11
2     0  to the right of    9
3     0  to the right of    6
4     2   to the left of    8
5     2   to the left of    4
6     2   to the left of    3
7     3  to the right of    2
8     4  to the right of    2
9     6   to the left of    0
10    7   to the left of   11
11    8  to the right of    2
12    9   to the left of    0
13   10  to the right of    0
14   11  to the right of    7
15   11  to the right of    0