What size is the empty glass?
The glass is large.
    src        edge_attr  dst
0     0   to the left of    4
1     1        on top of    2
2     1   to the left of    7
3     1        on top of   12
4     1   to the left of   19
..  ...              ...  ...
59   19  to the right of   16
60   19        on top of    2
61   20   to the left of   11
62   20  to the right of   19
63   20   to the left of   18

[64 rows x 3 columns]