Does the sky look white?
No, the sky is blue.
    src        edge_attr  dst
0     0   on the side of    6
1     0   to the left of    8
2     0  to the right of    1
3     0   to the left of    3
4     1   to the left of    8
5     1   to the left of    0
6     1   to the left of    3
7     3  to the right of    1
8     3   to the left of    4
9     3  to the right of    0
10    4  to the right of    3
11    4   to the left of    7
12    4   to the left of    9
13    7  to the right of   11
14    7  to the right of    4
15    8  to the right of    0
16    8  to the right of    1
17    9  to the right of   11
18    9  to the right of    4
19   11   to the left of    7
20   11   to the left of    9