The buildings are of which color?
The buildings are brown.
    src        edge_attr  dst
0     0               of   12
1     0   to the left of    6
2     0  to the right of    5
3     1               of   12
4     2               of   12
5     3  to the right of   18
6     3               of   12
7     4               of   12
8     4   to the left of    6
9     5   to the left of    0
10    5               of   12
11    6  to the right of   13
12    6  to the right of   14
13    6       covered by   11
14    6  to the right of    0
15    6  to the right of    4
16    6  to the right of    7
17    6  to the right of   12
18    7   to the left of    6
19    8  to the right of   14
20    8  to the right of   18
21   10               in   11
22   11         covering    6
23   11         covering   17
24   12               in   11
25   12  to the right of   18
26   12   to the left of    6
27   13   to the left of    6
28   14   to the left of    6
29   14   to the left of    8
30   15  to the right of   17
31   17       covered by   11
32   17   to the left of   15
33   18   to the left of    3
34   18   to the left of    8
35   18   to the left of   12