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Old 12-02-2023, 12:02 PM   #478
theducks
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Quote:
Originally Posted by The Holy View Post
What disadvantages would that be?
False Positive.
ISBN are patterns, so 13 digits is not different than any other 13 digits without other checks, Even with those, a false one can pass

You might do some research and see how they are assigned and may be printed. OH! Groupings for one
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