Is the tree behind or in front of the zebra the grass is under of?
The tree is behind the zebra.
    src        edge_attr  dst
0     0         covering    4
1     0  to the right of    6
2     0   to the left of    3
3     1               on    4
4     1           eating    4
5     1            above    4
6     1      in front of    3
7     2  to the right of    9
8     2               of    1
9     3  to the right of    0
10    3  to the right of    6
11    3           behind    1
12    4            under    1
13    4       covered by    0
14    5               of    1
15    5  to the right of    9
16    6   to the left of    3
17    6   to the left of    0
18    7               of    1
19    8  to the right of    9
20    8               of    1
21    9               of    1
22    9   to the left of    2
23    9   to the left of    8
24    9   to the left of    5
25    9   to the left of   10
26   10               of    1
27   10  to the right of    9