Is the sky both clear and blue?
No, the sky is blue but cloudy.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    9
2     1   to the left of   11
3     1   to the left of    8
4     1  to the right of    2
5     2   to the left of    1
6     3  to the right of   11
7     3  to the right of    9
8     3  to the right of    5
9     3  to the right of    0
10    5   to the left of   11
11    5   to the left of    3
12    8  to the right of    1
13    9  to the right of    0
14    9   to the left of    3
15   11   to the left of    3
16   11  to the right of    5
17   11  to the right of    1