What is surrounding the green grass?
The trees are surrounding the grass.
    src        edge_attr  dst
0     0  to the right of   17
1     0   to the left of   16
2     0   to the left of   14
3     0   to the left of   15
4     2    surrounded by   15
5     4   to the left of   15
6     4  to the right of   17
7     7  to the right of   17
8     8           behind   15
9    10   to the left of   17
10   11  to the right of   17
11   12   to the left of   14
12   13  to the right of   17
13   14  to the right of    0
14   14           around    2
15   14  to the right of   12
16   14  to the right of   17
17   15  to the right of    4
18   15  to the right of    0
19   15  to the right of   17
20   15      in front of    8
21   15      surrounding    2
22   16           flying    7
23   16          holding    7
24   16  to the right of    0
25   17   to the left of   15
26   17   to the left of    7
27   17   to the left of    4
28   17   to the left of    0
29   17   to the left of   14
30   17   to the left of   13
31   17   to the left of   11
32   17  to the right of   10