Is the sky white and clear?
Yes, the sky is white and clear.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of    8
2     1               on    4
3     1   to the left of    8
4     2  to the right of    8
5     2               by    8
6     2               by    4
7     3   to the left of    4
8     3  to the right of    7
9     4  to the right of    8
10    4  to the right of    3
11    4               by    2
12    5   to the left of    0
13    7   to the left of    3
14    7   to the left of    8
15    8   to the left of    2
16    8   to the left of    4
17    8  to the right of    7
18    8  to the right of    1
19    8   to the left of    0