Is there either any sand or grass that is not brown?
No, there is grass but it is brown.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    2
2     0               on    1
3     1   to the left of   12
4     1   to the left of   11
5     1   to the left of   10
6     1   to the left of    5
7     2   to the left of   11
8     2  to the right of    0
9     3   to the left of   11
10    3   to the left of   10
11    5  to the right of    1
12    5   to the left of    7
13    5   to the left of    6
14    5  to the right of   12
15    5  to the right of   10
16    6  to the right of   12
17    6  to the right of   10
18    6  to the right of    7
19    6  to the right of    5
20    7  to the right of    5
21    7   to the left of    6
22    7  to the right of   10
23    7  to the right of   12
24    8   to the left of   10
25    8   to the left of   11
26   10   to the left of   12
27   10   to the left of    5
28   10  to the right of    3
29   10  to the right of    1
30   10  to the right of    8
31   10   to the left of    7
32   10   to the left of    6
33   11  to the right of    3
34   11  to the right of    0
35   11  to the right of    2
36   11  to the right of    1
37   11  to the right of    8
38   12   to the left of    7
39   12  to the right of   10
40   12   to the left of    5
41   12   to the left of    6
42   12  to the right of    1