This program opens lists of stuff, then looks through them for duplicut ones.
EUB CDKey validator by: Pro_Tech    //    OP GBR  @  europe
http://www.probots.cjb.net

Paste into the "Keys.txt" everything you want to sort thought.
Open the program.
Press Sort List
Wait for it to finish validating them.
Results will be shown on the program and printed into "Dupes.txt" and "Final.txt"