Which color do you think the sandy ground is?
The ground is brown.
    src        edge_attr  dst
0     4  to the right of    7
1     4  to the right of    5
2     5   to the left of    4
3     5   to the left of   10
4     6   to the left of   11
5     7   to the left of   11
6     7   to the left of    4
7     9   to the left of   11
8     9   to the left of   10
9    10  to the right of    9
10   10  to the right of    5
11   11           behind   13
12   11  to the right of    6
13   11  to the right of    9
14   11  to the right of    7
15   13      in front of   11