def dungettext(self, domain, singular, plural, num):
        return self._domains.get(domain, self).ungettext(singular, plural, num)
check if elements is list l are unique.
dataset/ETHPy150Open ibagrak/algae/gae/libs/babel/support.py/Translations.dungettext--crossover with--dataset/ETHPy150Open CGATOxford/cgat/refactor/cgat_refactor.py/checkUnique