What color are the walls?
The walls are white.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    2
2     0   to the left of   14
3     1  to the right of    5
4     2  to the right of    0
5     3               on    4
6     3   to the left of   15
7     4  to the right of    5
8     4   to the left of    8
9     4  to the right of    6
10    4   to the left of   15
11    5   to the left of   10
12    5   to the left of    1
13    5   to the left of    4
14    5   to the left of   18
15    5   to the left of   15
16    5   to the left of   11
17    5   to the left of   16
18    5   to the left of    7
19    5             with    9
20    6   to the left of    9
21    6               on    5
22    6   to the left of    4
23    7  to the right of   10
24    7  to the right of   16
25    7   to the left of    8
26    7  to the right of    5
27    8  to the right of   16
28    8             with    9
29    8  to the right of    7
30    8  to the right of   18
31    8  to the right of   10
32    8  to the right of    4
33    8  to the right of   11
34    9   to the left of   11
35    9               on    5
36    9  to the right of    6
37   10   to the left of    8
38   10   to the left of    7
39   10  to the right of    5
40   11  to the right of    9
41   11               on   10
42   11   to the left of   15
43   11  to the right of    5
44   11   to the left of    8
45   12  to the right of    0
46   14  to the right of    0
47   15  to the right of    4
48   15  to the right of    3
49   15  to the right of   11
50   15  to the right of    5
51   16   to the left of    8
52   16   to the left of    7
53   16  to the right of    5
54   16   to the left of   18
55   18   to the left of    8
56   18  to the right of   16
57   18  to the right of    5