Is the sky blue and overcast?
No, the sky is blue but clear.
    src        edge_attr  dst
0     0   to the left of    4
1     0               on    1
2     2   to the left of    8
3     2   to the left of   10
4     2   to the left of    3
5     3  to the right of    2
6     4  to the right of    0
7     5   to the left of   10
8     5   to the left of    9
9     5   to the left of   11
10    7               on    0
11    7  to the right of    8
12    8  to the right of    2
13    8   to the left of   10
14    8   to the left of    7
15    9  to the right of    5
16   10  to the right of    8
17   10  to the right of    5
18   10  to the right of    2
19   11  to the right of    5
20   12            above    1