What animal is grazing on grass?
The zebra is grazing on grass.
    src        edge_attr  dst
0     0               of    5
1     1  to the right of    3
2     1               of    5
3     2  to the right of    3
4     2               of    5
5     3   to the left of    2
6     3   to the left of    7
7     3               of    5
8     3   to the left of    1
9     4               of    5
10    5       grazing on    6
11    5       walking in    6
12    5           eating    6
13    7  to the right of    3
14    7               of    5