code: def _escaped_token_to_subtoken_strings(self, escaped_token):
          
          # NOTE: This algorithm is greedy; it won't necessarily produce the "best"
          # list of subtokens.
          ret = []
          start = 0
          token_len = len(escaped_token)
          while start < token_len:
              for end in xrange(min(token_len, start + self._max_subtoken_len), start, -1):
                  subtoken = escaped_token[start:end]
                  if subtoken in self._all_subtoken_strings:
                      ret.append(subtoken)
                      start = end
                      break
  
              else:  # Did not break
                  # If there is no possible encoding of the escaped token then one of the
                  # characters in the token is not in the alphabet. This should be
                  # impossible and would be indicative of a bug.
                  assert False, "Token substring not found in subtoken vocabulary."
  
          return ret
docs: Converts an escaped token string to a list of subtoken strings.
  
          Args:
            escaped_token: An escaped token as a unicode string.
          Returns:
            A list of subtokens as unicode strings.