What are the vegetables to the left of the broccoli called?
The vegetables are carrots.
    src        edge_attr  dst
0     2   to the left of   13
1     2   to the left of   10
2     5   to the left of    7
3     5   to the left of    9
4     7  to the right of    5
5     7   to the left of   17
6     7   to the left of   16
7     9  to the right of    5
8    10  to the right of    2
9    12   to the left of   16
10   13   to the left of   14
11   13  to the right of    2
12   13  to the right of   15
13   14  to the right of   13
14   15   to the left of   13
15   16   to the left of   17
16   16  to the right of    7
17   16  to the right of   12
18   17  to the right of   16
19   17  to the right of    7