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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 next_state_fluent_ordering(self) -> List[str]:
        '''The list of next state-fluent names in canonical order.

        Returns:
            List[str]: A list of fluent names.
        '''
        key = lambda x: x.name
        return [cpf.name for cpf in sorted(self.state_cpfs, key=key)]