use strict;
use warnings;
use tests::random;
sub shuffle {
my ($in, $cnt, $sz) = @_;
$cnt * $sz == length $in or die;
my (@a) = 0$cnt 1;
for my $i (0$cnt 1) {
my ($j) = $i + random_ulong () % ($cnt $i);
@a[$i, $j] = @a[$j, $i];
}
my ($out) = ;
$out .= substr ($in, $_ * $sz, $sz) foreach @a;
return $out;
}
1;
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