What is the cat on?
The cat is on the seat.
    src        edge_attr  dst
0     0  to the right of    4
1     2               on    1
2     2  to the right of    4
3     3  to the right of    4
4     4   to the left of    2
5     4   to the left of    0
6     4   to the left of    5
7     4   to the left of    3
8     4   to the left of    6
9     5  to the right of    4
10    6  to the right of    4