How big is the shelf?
The shelf is large.
     src        edge_attr  dst
0      0               on    1
1      0   to the left of    2
2      0  to the right of   16
3      0  to the right of    7
4      1  to the right of   24
..   ...              ...  ...
96    28   to the left of   27
97    28  to the right of   16
98    28  to the right of    7
99    29   to the left of   18
100   29   to the left of   14

[101 rows x 3 columns]