Returns the instantiated `fluents` for the given `ordering`.

        For each fluent in `fluents`, it instantiates each parameter
        type w.r.t. the contents of the object table.

        Returns:
            Sequence[Tuple[str, List[str]]]: A tuple of pairs of fluent name
            and a list of instantiated fluents represented as strings.

def _fluent_params(self, fluents, ordering) -> FluentParamsList:
        '''Returns the instantiated `fluents` for the given `ordering`.

        For each fluent in `fluents`, it instantiates each parameter
        type w.r.t. the contents of the object table.

        Returns:
            Sequence[Tuple[str, List[str]]]: A tuple of pairs of fluent name
            and a list of instantiated fluents represented as strings.
        '''
        variables = []
        for fluent_id in ordering:
            fluent = fluents[fluent_id]
            param_types = fluent.param_types
            objects = ()
            names = []
            if param_types is None:
                names = [fluent.name]
            else:
                objects = tuple(self.object_table[ptype]['objects'] for ptype in param_types)
                for values in itertools.product(*objects):
                    values = ','.join(values)
                    var_name = '{}({})'.format(fluent.name, values)
                    names.append(var_name)
            variables.append((fluent_id, names))
        return tuple(variables)