def alts_columns_used(self):
        return list(tz.unique(tz.concat(
            m.alts_columns_used() for m in self.models.values())))
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dataset/ETHPy150Open UDST/urbansim/urbansim/models/dcm.py/MNLDiscreteChoiceModelGroup.alts_columns_used--crossover with--dataset/ETHPy150Open ericgibert/supersid/supersid/tksidviewer.py/tkSidViewer.on_about