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What is the function of "When executing more than once, there should be one-to-one assignment of task instances to assignee's" checkbox from user input task in process model?

Hello,
I am studying process model and have question on the user input task.
From the Assignments tab --> options --> When executing more than once, there should be one-to-one assignment of task instances to assignee's.
what is the function of "When executing more than once, there should be one-to-one assignment of task instances to assignee's" ?
I see no difference in the result when checked or not.
Thank you.
