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Help with finished up the function. Required validity checks for the ISBN string include checking that: The ISBN consists of exactly 17 characters (13 digits

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Help with finished up the function.

Required validity checks for the ISBN string include checking that: The ISBN consists of exactly 17 characters (13 digits plus 4 separators). The ISBN consists of only digits and separators (hyphens or spaces). The ISBN consists of exactly 5 elements

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