Where is that grass?
The grass is in the pen.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of   13
2     0  to the right of   10
3     0  to the right of    4
4     1   to the left of   14
5     3  to the right of   13
6     3  to the right of   10
7     3      approaching    5
8     3    surrounded by    4
9     4   to the left of    0
10    4      surrounding    3
11    5   to the left of   16
12    5  to the right of   13
13    5  to the right of   10
14    6  to the right of   10
15    6  to the right of    8
16    6   to the left of    7
17    6   to the left of   16
18    6  to the right of    9
19    6  to the right of   13
20    6  to the right of   14
21    6  to the right of   12
22    6   to the left of    0
23    7  to the right of    6
24    7  to the right of   13
25    7  to the right of   10
26    8   to the left of    6
27    8               in    9
28    9   to the left of    6
29   10   to the left of    0
30   10   to the left of    5
31   10   to the left of    3
32   10   to the left of    7
33   10   to the left of    6
34   12   to the left of    6
35   13   to the left of    0
36   13   to the left of    5
37   13   to the left of    3
38   13   to the left of    6
39   13   to the left of    7
40   14  to the right of    1
41   14   to the left of    6
42   16  to the right of    6
43   16  to the right of    5