What are the three hidden numbers of this Universal Product Code?
If you said 666 you are right. No matter what Universal Product Code I asked you about, the hidden numbers are always 666. You will find the hidden numbers universally are 666. (See chapter 3.1 for how to decode the bar codes, and where to go for more information on this subject)
The hidden numbers happen to be 666 even if you are — say for instance — in Europe where they call their bar codes European Article Number EAR
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