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