Is the cloudy sky black or white?
The sky is white.
    src        edge_attr  dst
0     0  to the right of    1
1     1   to the left of    0
2     1  to the right of    4
3     3   to the left of    8
4     3   to the left of    7
5     3   to the left of    4
6     4   to the left of    1
7     4  to the right of    3
8     4   to the left of    5
9     5  to the right of    4
10    7  to the right of    3
11    8  to the right of    3