I'd create a lookup table:
#pseudo:

my %looupTable;

if (!$lookupTable{$yourkeyname}) {
     $lookupTable{$yourkeyname} = 1;
}

[download]

A million keys should run fine on a decent machine.

In reply to Re: How to remove duplicates from a large set of keys by jbrugger
in thread How to remove duplicates from a large set of keys by nite_man

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