in reply to creating all possible random 'words' from 4 letters

You may want to check out the O'Reilly book Mastering Algorithms in Perl if you can.

It has a permutation sample and heap of other algorithms that are explained pretty well.

Hanlon's Razor - "Never attribute to malice that which can be adequately explained by stupidity"
  • Comment on Re: creating all possible random 'words' from 4 letters

In Section Seekers of Perl Wisdom