Behind what kind of animal is the grass?
The grass is behind the zebra.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    1
2     0           behind    3
3     1   to the left of    2
4     1  to the right of    0
5     1   to the left of   13
6     1   to the left of    3
7     2  to the right of    1
8     2   to the left of   13
9     2   to the left of    3
10    3  to the right of    2
11    3               on    4
12    3               in   10
13    3  to the right of    1
14    3         touching    4
15    4  to the right of    0
16    5  to the right of   13
17    6   to the left of   11
18    6   to the left of   12
19    8   to the left of   11
20    8   to the left of   12
21   11  to the right of    8
22   11  to the right of    6
23   12  to the right of    8
24   12  to the right of    6
25   13  to the right of    2
26   13   to the left of    5
27   13  to the right of    1