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I can not list any products on the Amazon. When I'm listing the any products on the Amazon, Amazon keeps asking me UPC code. There is no upc code of the many of my products already. But sometimes I can find the UPC code. But at this time Amazon gets an error about they have already same product attached that UPC Code. Am I clear? If somebody listing before me, I can't list that item. This is ridiculous. I think that Amazon selling method is so complicated and confusing.