# Install pyston_lite_autoload to ~/.local/lib/python3.10/site-packages/.
$ python3 -m pip install --user pyston_lite_autoload

$ python3 llil.py big1.txt big2.txt big3.txt > out2.txt
collect time            :    4.4 s
sort_via_cmp_to_key time:   15.8 s
sort+format time        :   15.8 s
total processing time   :   20.2 s
output time             :    3.2 s
total time              :   23.4 s