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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 _fallback_to_available_output(self):
 """ Fallback to the first available output when the active layout was composed of only one output. This allows us to avoid cases where you get stuck with a black sreen on your laptop by switching back to the integrated screen automatically ! """

        if len(self.active_comb) == 1:
            self._choose_what_to_display(force_refresh=True)
            self._apply()
            self.py3.update()