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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 _force_force_on_start(self):
 """ Force the user configured mode on start. """

        if self.force_on_start in self.available_combinations:
            self.displayed = self.force_on_start
            self._choose_what_to_display(force_refresh=True)
            self._apply(force=True)
            self.py3.update()
        self.force_on_start = None