What is before the grass?
The fence is in front of the grass.
    src        edge_attr  dst
0     0      in front of   18
1     0  to the right of    1
2     0  to the right of   15
3     0  to the right of    8
4     0  to the right of   16
5     0  to the right of    4
6     1  to the right of   21
7     1  to the right of   13
8     1   to the left of    0
9     1  to the right of   12
10    3   to the left of    5
11    3  to the right of   25
12    3   to the left of   12
13    4  to the right of   12
14    4   to the left of   24
15    4   to the left of    0
16    4   to the left of   18
17    5  to the right of    3
18    5  to the right of   25
19    5   to the left of   12
20    6  to the right of   11
21    7  to the right of   11
22    8   to the left of    0
23    8      in front of   18
24    8               on   20
25    9      in front of   23
26   11   to the left of    6
27   11   to the left of    7
28   12  to the right of   25
29   12   to the left of   24
30   12   to the left of    4
31   12  to the right of    3
32   12  to the right of    5
33   12   to the left of    1
34   13   to the left of    1
35   14   to the left of   24
36   14   to the left of   18
37   15   to the left of    0
38   16   to the left of    0
39   17           beside    8
40   17               by   20
41   18  to the right of    4
42   18           behind    0
43   18           behind    8
44   18  to the right of   14
45   18   to the left of   19
46   19  to the right of   18
47   21   to the left of    1
48   21      coming from    8
49   23               by    9
50   23           behind    9
51   23               on   22
52   24  to the right of   14
53   24  to the right of   12
54   24  to the right of    4
55   25   to the left of   12
56   25   to the left of    5
57   25   to the left of    3