Is the door gray or yellow?
The door is gray.
    src        edge_attr  dst
0     0  to the right of    8
1     0  to the right of    9
2     0   to the left of    2
3     0  to the right of   14
4     2  to the right of    0
5     2   to the left of   16
6     3  to the right of   15
7     3  to the right of   14
8     4  to the right of   15
9     4  to the right of   14
10    5  to the right of   14
11    6  to the right of   14
12    8   to the left of    0
13    9   to the left of    0
14   13  to the right of   14
15   13  to the right of   15
16   14       looking at   18
17   14       looking at   15
18   14       looking at   13
19   14   to the left of    3
20   14       looking at   19
21   14   to the left of    4
22   14   to the left of   13
23   14   to the left of   15
24   14   to the left of    5
25   14   to the left of    6
26   14   to the left of    0
27   15  to the right of   14
28   15   to the left of    3
29   15   to the left of    4
30   15   to the left of   13
31   16  to the right of    2