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This is actually a classic algorithm used for things like dealing a pack of cards. If you are dealing bridge hands, for example, you want 52 different cards with no repeats. Some games use multiple packs and/or cut down packs (Bézique uses a pack of 2 decks, A down to 7). You therefore set up a pack with all the possible cards, deal one at random, move the last card to the position from which the card was taken & reduce the pack by one. So, for your problem:
```use strict;
use warnings;

my \$nRepeats = 2;
my @sSet = qw (a b c d e f);
my \$nLength = 12;

my @sAll;
for (1..\$nRepeats) {
push (@sAll, @sSet);
}

if (\$nLength - 1 > \$#sAll) {die "Don't be silly"}

my \$sString;
for (1..\$nLength) {
my \$i = int(rand(@sAll));
\$sString .= \$sAll[\$i];
\$sAll[\$i] = \$sAll[-1];
pop(@sAll);
}

print "\$sString \n";
Now, I'm a beginner. So if anyone sees anything that could be improved (apart from Hungarian notation - it helps me conceptualise strong typing), I'd love to know.

Regards,

John Davies

Update: Re-reading your question, if AABAABAABAAB is valid, my code won't do what you want, but I'm not clear on whether that's what you mean.

In reply to Re: Random data generation. by davies
in thread Random data generation. by BrowserUk

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