What color is the sky?
The sky is blue.
    src        edge_attr  dst
0     0               in    7
1     0  to the right of    6
2     1  to the right of    5
3     3           behind    9
4     3  to the right of    5
5     3           behind    8
6     3           behind    4
7     4  to the right of    9
8     4      in front of    3
9     5   to the left of    3
10    5   to the left of    1
11    5   to the left of    9
12    6   to the left of    0
13    8  to the right of   11
14    8      in front of    3
15    9  to the right of    5
16    9   to the left of    4
17    9      in front of    3
18   10               on    3
19   11   to the left of    8