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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_panels(self):
 """Returns the Panel instances registered with this dashboard in order. Panel grouping information is not included. """

        all_panels = []
        panel_groups = self.get_panel_groups()
        for panel_group in panel_groups.values():
            all_panels.extend(panel_group)
        return all_panels