How big is the fence to the left of the zebra?
The fence is large.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    1
2     0            above    2
3     0  to the right of    3
4     1               by    6
5     1   to the left of    0
6     3   to the left of    7
7     3   to the left of    0
8     6   to the left of    0
9     7               of    0
10    7  to the right of    3