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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 _escaped_token_to_subtoken_ids(self, escaped_token):
 """Converts an escaped token string to a list of subtoken IDs. Args: escaped_token: An escaped token as a unicode string. Returns: A list of subtoken IDs as integers. """

    return [
        self._subtoken_string_to_id[subtoken]
        for subtoken in self._escaped_token_to_subtoken_strings(escaped_token)
    ]