What color is that sky?
The sky is gray.
    src        edge_attr  dst
0     2  to the right of   11
1     4  to the right of   11
2     7  to the right of   13
3     8  to the right of   11
4     9  to the right of   11
5     9         swinging    4
6    10  to the right of   13
7    11   to the left of    8
8    11   to the left of    9
9    11   to the left of    2
10   11   to the left of    4
11   11   to the left of   12
12   12  to the right of   11
13   13   to the left of   10
14   13   to the left of    7