What is the color of the train that the building is behind of?
The train is black.
    src        edge_attr  dst
0     0  to the right of   13
1     0   to the left of   12
2     1   to the left of    9
3     2      in front of   15
4     2   to the left of   10
5     2   to the left of    3
6     2   to the left of   14
7     2   to the left of    8
8     2   to the left of    7
9     3  to the right of    2
10    4   to the left of   11
11    7  to the right of    2
12    8  to the right of    2
13    9  to the right of    1
14    9   to the left of   10
15   10  to the right of    2
16   10  to the right of    9
17   10  to the right of   13
18   11  to the right of    4
19   12  to the right of    0
20   12  to the right of   13
21   13   to the left of    0
22   13   to the left of   12
23   13   to the left of   10
24   14  to the right of    2
25   15           behind    2