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