Frequently Asked Questions

  • How do I get information about Sora?

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    Sora

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  • What is an ISBN?

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    An ISBN is an International Standard Book Number. ISBNs were 10 digits in length up to the end of December 2006, but since 1 January 2007 they now always consist of 13 digits. ISBNs are calculated using a specific mathematical formula and include a check digit to validate the number.

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