Are there both grass and sand?
Yes, there are both sand and grass.
    src        edge_attr  dst
0     1  to the right of    7
1     2             near    3
2     2               on    6
3     3             near    2
4     4               on    6
5     4  to the right of   10
6     4  to the right of    7
7     5   on the side of    3
8     7   to the left of    1
9     7               on    6
10    7               on    2
11    7   to the left of    4
12    7   to the left of   13
13   10               on    6
14   10               on    2
15   10   to the left of   13
16   10   to the left of    4
17   13  to the right of   10
18   13  to the right of    7