What color is the small tower?
The tower is brown.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    3
2     0  to the right of    2
3     1  to the right of   12
4     1  to the right of    9
5     2   to the left of   15
6     2   to the left of   19
7     2   to the left of    6
8     2   to the left of    0
9     2   to the left of    7
10    3   to the left of    6
11    3   to the left of    7
12    3   to the left of    0
13    3   to the left of   19
14    3   to the left of   15
15    4   to the left of   18
16    4   to the left of    7
17    4   to the left of   19
18    4   to the left of    0
19    5  to the right of   13
20    5  to the right of   12
21    6  to the right of    3
22    6  to the right of    2
23    6               on   19
24    7  to the right of    3
25    7  to the right of    2
26    7  to the right of    4
27    9   to the left of   16
28    9   to the left of    1
29   12   to the left of    1
30   12   to the left of    5
31   13   to the left of    5
32   15  to the right of    2
33   15  to the right of    3
34   16  to the right of    9
35   18  to the right of    4
36   19  to the right of    4
37   19  to the right of    3
38   19  to the right of    2