What is the zebra surrounded by?
The zebra is surrounded by the grass.
    src        edge_attr  dst
0     0   to the left of    8
1     1           around    4
2     1      surrounding    4
3     2  to the right of    8
4     3               of    7
5     4           eating    1
6     4    surrounded by    1
7     4               in    1
8     5               of    4
9     5  to the right of    8
10    5   to the left of    7
11    6               of    4
12    7  to the right of    5
13    7  to the right of    8
14    8   to the left of    9
15    8   to the left of    7
16    8  to the right of    0
17    8   to the left of    2
18    8   to the left of    5
19    9  to the right of    8