How large is that pool?
The pool is small.
    src        edge_attr  dst
0     0   to the left of    8
1     1  to the right of   15
2     1  to the right of   20
3     1  to the right of    4
4     2   to the left of    5
..  ...              ...  ...
60   21               by   23
61   21   to the left of    6
62   21  to the right of   15
63   22               in   23
64   23  to the right of   15

[65 rows x 3 columns]