code: def hangul_to_jamo(hangul_string):
      
      return (_ for _ in
              chain.from_iterable(_hangul_char_to_jamo(_) for _ in
                                  hangul_string))
docs: Convert a string of Hangul to jamo.
      Arguments may be iterables of characters.
  
      hangul_to_jamo should split every Hangul character into U+11xx jamo
      characters for any given string. Non-hangul characters are not changed.
  
      hangul_to_jamo is the generator version of h2j, the string version.