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For examples of extensions using this hook, see Category:BSBookshelfExportTag extensions . Category:Extension hooks#BSBookshelfExportTag Category:Undocumented extension hooks#BSBookshelfExportTag Category:Extension hooks provided by UEModuleBookPDF Category:Extension hooks#BSBookshelfExportTag Category:Undocumented extension hooks#BSBookshelfExportTag Category:Extension hooks provided by UEModuleBookPDF