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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_lv_load_area_group(self, lv_load_area_group):
 """Adds a LV load_area to _lv_load_areas if not already existing. """

        if lv_load_area_group not in self.lv_load_area_groups():
            self._lv_load_area_groups.append(lv_load_area_group)