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A method for ful? lling requests in an inventory system includes receiving a request indicating an activity to be com pleted. The method also includes selecting a holder to ful? ll the request and an inventory station at Which to ful? ll the request. The inventory station is associated With a queue that includes a plurality of queue spaces. The method further includes moving the selected holder from a? rst location to a second location remote from the selected inventory station. Additionally, the method also includes determining that a trigger event has occurred and, in response to determining that the trigger event has occurred, moving the selected holder from the second location to a queue space of a queue associ ated With the selected inventory station.