What animal is in front of the fence?
The zebras are in front of the fence.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    2
2     1   to the left of   12
3     2   to the left of   12
4     2  to the right of    0
5     3  to the right of    9
6     3  to the right of    4
7     4   to the left of    6
8     4   to the left of    3
9     4  to the right of    9
10    5  to the right of    9
11    5   to the left of    6
12    6  to the right of    4
13    6  to the right of    5
14    6  to the right of    9
15    6   to the left of   12
16    8   to the left of   12
17    9   to the left of   10
18    9   to the left of    5
19    9   to the left of    4
20    9   to the left of    3
21    9   to the left of    6
22   10  to the right of    9
23   10   to the left of   12
24   10               in    7
25   10      in front of   11
26   10               in   13
27   11           behind   10
28   12  to the right of   10
29   12  to the right of    8
30   12  to the right of    6
31   12  to the right of    2
32   12  to the right of    0
33   12  to the right of    1
34   12               in   13