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Identify the missing word(s) in the following sentence within the context of Microsoft Azure. [?] occurs when one transaction has a lock on a resource, and another transaction has a lock on a second resource. Each transaction then attempts to take a lock on the resource which is currently locked by the other transaction. This scenario would lead to an infinite wait, as neither transaction could complete. [?] is recorded in the system_health extended event session which is enabled by default.