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