Hi everyone I am new to Salesforce

I am facing some issue. When I change stage value in opportunity to Qualification, some task should be created but after some time again I made changes the stage values like Qualification to prospecting and again prospecting to Qualification there is a repetition of Task again which I don't want to create.

How can I do that in Process Builder? I want to create a task only one time for one stage value even I do changes repeatedly. And I set the value of repeat the task to Task closed.

Note: I have to do this in process builder only