How to erase all Duplicates in ITUNE????

I have been trying to find out how to erase ALL of these duplicate songs that I have with just one click. Goning one by one does not make any sense with the tecnology at had? Does any one know how?

1. Backup your data first.
2. Make sure that you have your Apple ID and Password.
2. Erase and Reinstall:   OS X Lion: Erase and reinstall Mac OS X

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