my $n_tests       = 1_000_000;

    my $error= 1+ int rand 5;
    my $A      = rand64($n_err + 1 + rand 50);
    my $B      = rand64($n_err + 1 + rand 50);
    my $prefix = rand64($n_err + 1 + rand 20);

> Took: 2.20354223251343 sec

##</code><code>##

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

> Took: 56.4621770381927