def columns_used(self):
        return list(tz.unique(tz.concatv(
            self.choosers_columns_used(),
            self.alts_columns_used(),
            self.interaction_columns_used())))
Converts WEB representation to HEX
dataset/ETHPy150Open UDST/urbansim/urbansim/models/dcm.py/MNLDiscreteChoiceModel.columns_used--crossover with--dataset/ETHPy150Open vaab/colour/colour.py/web2hex