What is in the glass made of plastic?
The liquid is in the glass.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of   22
2     0  to the right of    9
3     0   to the left of   19
4     0   to the left of    1
..  ...              ...  ...
92   21  to the right of   16
93   22  to the right of    3
94   22   to the left of   13
95   22  to the right of    0
96   22  to the right of   19

[97 rows x 3 columns]