What vehicle is to the right of the cart?
The vehicle is a train.
   src        edge_attr  dst
0    2  to the right of    9
1    4   to the left of    5
2    5  to the right of   10
3    5  to the right of    4
4    6               on   10
5    9   to the left of    2
6   10   to the left of    5