Method List
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#check_digit Jancode::GTIN
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#company_prefix Jancode::GTIN
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create Jancode
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#create Jancode::GTIN
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#initialize Jancode::GTIN
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#item_code Jancode::GTIN
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#validation Jancode::GTIN13
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#validation Jancode::GTIN8
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verification? Jancode