What vegetable is to the left of the potato?
The vegetable is a tomato.
   src        edge_attr  dst
0    0   to the left of    7
1    0  to the right of    2
2    0  to the right of    1
3    1   to the left of    0
4    1   to the left of    6
5    2   to the left of    0
6    3  to the right of   13
7    6  to the right of    1
8    7  to the right of    0
9   13   to the left of    3