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    my $n_tests       = 1_000_000;

...
    my $prefix = rand64($n_err + 1 + rand 20);

> Took: 2.20354223251343 sec

my $n_tests       = 100_000;
my $min_str       = 2000;# 50;
my $max_overlap   = 500; #20;

> Took: 56.4621770381927