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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 segment(self, *args):
 """Segment one or more datasets with this subword field. Arguments: Positional arguments: Dataset objects or other indexable mutable sequences to segment. If a Dataset object is provided, all columns corresponding to this field are used; individual columns can also be provided directly. """

        sources = []
        for arg in args:
            if isinstance(arg, Dataset):
                sources += [getattr(arg, name) for name, field in
                            arg.fields.items() if field is self]
            else:
                sources.append(arg)
        for data in sources:
            for x in tqdm(data, 'segmenting'):
                x[:] = self.vocab.segment(x)