What is on the shelf?
The plants are on the shelf.
    src        edge_attr  dst
0     0               on    1
1     2   to the left of   23
2     3  to the right of   11
3     6  to the right of   12
4    10   on the side of    9
5    11   to the left of   16
6    11   to the left of   19
7    11   to the left of    3
8    12        on top of   28
9    12   to the left of    6
10   12   to the left of   27
11   16            using    3
12   16  to the right of   11
13   17               on   10
14   19  to the right of   11
15   19  to the right of   23
16   19   to the left of   24
17   21               on   10
18   21  to the right of   25
19   22               on   10
20   23   to the left of   19
21   23  to the right of    2
22   24  to the right of   19
23   25   to the left of   21
24   25               on   10
25   27             near   28
26   27  to the right of   12
27   27  to the right of   28
28   28   to the left of   27
29   28             near   27