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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 add_rollback_panels(self):

 """
 Adds rollback panel to applicable model class's edit handlers.
 """

        from wagtailplus.utils.edit_handlers import add_panel_to_edit_handler
        from wagtailplus.wagtailrollbacks.edit_handlers import HistoryPanel

        for model in self.applicable_models:
            add_panel_to_edit_handler(model, HistoryPanel, _(u'History'))