Which kind of fruit is on the shelf?
The fruits are apples.
    src        edge_attr  dst
0     0               on    1
1     0  to the right of    3
2     1               on    6
3     2               on    1
4     2  to the right of    4
5     2  to the right of    3
6     3   to the left of    4
7     3   to the left of    0
8     3   to the left of    2
9     4  to the right of    3
10    4   to the left of    2
11    5               on   11
12    7               by    1
13    7               on    6
14    8  to the right of   11
15    8  to the right of    9
16    9               on   11
17    9   to the left of    8
18    9   to the left of   12
19   11   to the left of    8
20   11   to the left of   12
21   12               of    1
22   12  to the right of    9
23   12  to the right of   11