Which color is the sky?
The sky is white.
    src        edge_attr  dst
0     0               on    3
1     0   to the left of    4
2     2  to the right of   13
3     4  to the right of    7
4     4  to the right of    0
5     7  to the right of   10
6     7   to the left of    4
7     8  to the right of   13
8    10            under   11
9    10   to the left of    7
10   10            below   11
11   11            above   10
12   12               on    5
13   13   to the left of    8
14   13   to the left of    2