On which side are the shelves?
The shelves are on the left of the image.
     src        edge_attr  dst
0      0   to the left of   38
1      0   to the left of   22
2      0   to the left of   43
3      0  to the right of   42
4      0  to the right of   20
..   ...              ...  ...
317   50   to the left of   25
318   50   to the left of   27
319   50   to the left of   30
320   50   to the left of    0
321   50   to the left of    2

[322 rows x 3 columns]