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null loop

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1503.36 (318,554th) 		Reputation
140 (578,629th)
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Title Δ
How do I validate a UPC or EAN code? 0.00
How to invoke code within a web app that isn't externally open? +3.36
EAN 8 : How to calculate checksum digit? 0.00
How can I lookup data about a book from its barcode number? 0.00