Which color is the curtain?
The curtain is brown.
    src        edge_attr  dst
0     0               on   10
1     0   to the left of    9
2     0  to the right of    1
3     1  to the right of   10
4     1   to the left of    0
5     1  to the right of    4
6     1               on   10
7     2   to the left of    9
8     2   to the left of   13
9     3  to the right of    4
10    4   to the left of    7
11    4   to the left of    8
12    4   to the left of   10
13    4   to the left of   16
14    4   to the left of   15
15    4   to the left of   12
16    4   to the left of    1
17    4   to the left of    3
18    7   to the left of   12
19    7  to the right of    4
20    8               on   10
21    8   to the left of    9
22    8  to the right of    4
23    9  to the right of    2
24    9  to the right of   13
25    9  to the right of    0
26    9  to the right of   15
27    9  to the right of   16
28    9  to the right of    8
29   10   to the left of    1
30   10   to the left of   16
31   10  to the right of    4
32   11  to the right of   15
33   12  to the right of    7
34   12  to the right of    4
35   13   to the left of    9
36   13  to the right of    2
37   15   to the left of    9
38   15   to the left of   11
39   15  to the right of    4
40   15               on    3
41   16  to the right of   10
42   16  to the right of    4
43   16   to the left of    9