code: def process(self, text_string):
          
          output = [self._convert_num(self._convert_consonant(token)) for
                    token in text_string]
          return output
docs: Expects a list of tokens, will return the list converted from ATF
          format to print-format.
  
          input = ["a", "a2", "a3", "geme2", "bad3", "buru14"]
          output = ["a", "á", "à", "géme", "bàd", "buru₁₄"]
  
          :param text_string: string
          :return: text_string