How do return to previous tasks in BPMN 2.0?

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I am creating a business process model with Visio 2010 and was wondering how to go back a few tasks (loop)?

Example: a document can be approved or rejected. When the document is approved, the process ends and that's it. When a document is rejected, the process should start over from "Task 2".

How do I visually show this the best way? Creating a task with "Start At Task 2.1" seems wrong.

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