What color is the door?
The door is black.
    src        edge_attr  dst
0     0               on    1
1     0   to the left of    2
2     1  to the right of    6
3     2  to the right of    0
4     2               on    1
5     3   to the left of    7
6     3   to the left of    4
7     4  to the right of    3
8     4   to the left of    7
9     5  to the right of    7
10    6   to the left of    1
11    7  to the right of    4
12    7   to the left of    5
13    7  to the right of    3