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...eturn false, 'invalid prefix'; -- fail when isbn13 does not begin with 978 or 979 section 2, pages 9–12.

-- See [[:en:Template:Convert/Transwiki guide]] if copying to another wiki. -- That module would be transcluded in only a small number of pages, so there should be

-- if not supplied, it will use the Wikidata ID associated with the current page. -- e.g. "[[Category:Articles with missing Wikidata information]]", or "" to disable: