Does the sky look clear?
Yes, the sky is clear.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    5
2     0   to the left of   11
3     1   to the left of   11
4     3   to the left of    5
5     3   to the left of    7
6     5   to the left of    0
7     5  to the right of    3
8     7  to the right of    3
9     7   to the left of    0
10    8   to the left of   11
11   11  to the right of    8
12   11  to the right of    1
13   11  to the right of    0