I cleverly forgot to declare @unsorted and @sorted. This is why one should (a) test code before posting and (b) use strict; and use warnings;.
They do wonders to prevent things like:
@array = (1,2,3,4,5,6,7,8,9);
$sum+= $_ foreach @array;
$mean = $sum/scalar(@aray);
(Yes, I know scalar(@aray) is 0.)
At that time  the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.
—Igor Sikorsky, reported in AOPA Pilot
magazine February 2003.
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