What is the name of the vegetable to the left of the broccoli?
The vegetable is a carrot.
   src        edge_attr  dst
0    0               on    5
1    1               on    5
2    2  to the right of    6
3    2               on    5
4    3               on    5
5    4               on    5
6    4  to the right of    6
7    6   to the left of    4
8    6   to the left of    2
9    6               on    5