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.../ManySubstitutions>perl mceparallel.pl nightfall.txt
file: nightfall.txt  mins: 0  secs: 5.763
file: nightfall.txt  mins: 0  secs: 4.290
file: nightfall.txt  mins: 0  secs: 4.179
file: nightfall.txt  mins: 0  secs: 4.293

use strict;
use warnings;
...
4.842 secs Child -20048 finished working on nightfall3.txt!
4.844 secs Parent talking...all my children are finished! Hooray!

File sizes for reference:
10/04/2022  06:44 PM        80,748,006 nightfall.txt
...
10/08/2022  01:30 PM        20,187,078 nightfall2.txt
10/08/2022  01:30 PM        20,187,057 nightfall3.txt
10/08/2022  01:30 PM        20,186,865 nightfall4.txt