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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 to_dict(self):
 """ Returns the underlying data as a Python dict. """

        return {
            "state_size": self.state_size,
            "chain": self.chain.to_json(),
            "parsed_sentences": self.parsed_sentences if self.retain_original else None
        }