Is the shelf on the left side or on the right of the image?
The shelf is on the left of the image.
     src        edge_attr  dst
0      0   to the left of    5
1      0   to the left of    4
2      1   to the left of   20
3      1  to the right of    2
4      2   to the left of   27
..   ...              ...  ...
99    29  to the right of   17
100   29   to the left of   18
101   29  to the right of   31
102   29  to the right of   26
103   31   to the left of   29

[104 rows x 3 columns]