What is the bird perched on?
The bird is perched on the fence.
    src        edge_attr  dst
0     0       perched on   10
1     1   to the left of    9
2     2   to the left of    7
3     3   to the left of    4
4     4  to the right of    3
5     5   to the left of    7
6     7  to the right of    2
7     7  to the right of    5
8     9               on   12
9     9  to the right of    1
10   12     covered with    1