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