And if most people reading this knew what a permutation was they would have known that the original poster wasn't asking for permutations. Search engines are great..unless you don't actually know what you are supposed to be looking for.

Of 5 solutions, the first nailed it, and the fourth was correct only because the poster of the link didn't know what a permutation was either. The other 3 - including your suggestion - were wrong because you were mislead by the word choice.

Many other valid solutions exist. Quantum::Superpositions being an obfuscated one and

for (glob '{1,2,3,4,5}\ {q,w,e,r,t}\ {junk,crap,spam,crud,kipple}') {
  print "$_\n";
}
[download]

being a short one. Or you could try figuring out Re (tilly) 1 (perl): What Happened...(perils of porting from c)...