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use v5.030;
use threads;
...
}

$_->join for threads->list;

$ perl test6.pl | LC_ALL=C sort -u | wc -l
32000000
...

$ perl test6.pl | LC_ALL=C sort -u | wc -l
32000000

$ perl test6.pl | LC_ALL=C sort -u | wc -l
25105304
...

$ perl test6.pl | LC_ALL=C sort -u | wc -l
25290392

perl test6.pl | LC_ALL=C mcesort -j6 -u | wc -l