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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 get_train_fns(self) -> Tuple[List[str], List[str]]: """ Fetches the training set of the corpus. Outputs a Tuple of size 2, where the first element is a list of paths to input features files, one per utterance. The second element is a list of paths to the transcriptions. """

        return self.prefixes_to_fns(self.train_prefixes)