Are there any cows by the fence made of metal?
Yes, there is a cow by the fence.
    src        edge_attr  dst
0     1               by    0
1     1               in   11
2     3   to the left of   12
3     5   to the left of   12
4     5   to the left of   13
5     6   to the left of   11
6    11  to the right of    6
7    11  to the right of   14
8    12  to the right of    5
9    12  to the right of   13
10   12  to the right of    3
11   13   to the left of   12
12   13  to the right of    5
13   14   to the left of   11