How thick is the sliced vegetable that is to the left of the onion?
The tomato is thin.
    src          edge_attr  dst
0     0  sitting on top of    1
1     3    to the right of   14
2     3     to the left of   13
3     3     to the left of    5
4     4     to the left of   13
5     4    to the right of   14
6     5    to the right of    3
7     6     to the left of    7
8     6     to the left of    9
9     7    to the right of    6
10    8     to the left of   10
11    8     to the left of   14
12    9    to the right of    6
13   10    to the right of    8
14   11     to the left of   12
15   12    to the right of   11
16   13    to the right of    3
17   13    to the right of    4
18   14     to the left of    4
19   14     to the left of    3
20   14    to the right of    8