Is the shelf on the right side or on the left of the image?
The shelf is on the right of the image.
    src        edge_attr  dst
0     0  to the right of   13
1     1               on    9
2     3  to the right of    5
3     3  to the right of    8
4     3  to the right of    7
5     3  to the right of   12
6     5   to the left of   14
7     5   to the left of    3
8     5  to the right of   12
9     6               of    8
10    7   to the left of   14
11    7   to the left of    3
12    8   to the left of    3
13   12   to the left of    3
14   12               of   12
15   12   to the left of   14
16   12   to the left of    5
17   13   to the left of    0
18   14  to the right of    5
19   14  to the right of   12
20   14  to the right of    7
21   15               on    9