code: def _spoken_representation_L1(lst_lst_char):
      
      s = ''
      inter_char = ' '
      inter_word = inter_char * 9
      for i, word in enumerate(lst_lst_char):
          if i >= 1:
              s += inter_word
          for j, c in enumerate(word):
              if j != 0:
                  s += inter_char
              s += _char_to_string_morse(c)
      return s
docs: >>> lst = [['M', 'O', 'R', 'S', 'E'], ['C', 'O', 'D', 'E']]
      >>> _spoken_representation_L1(lst)
      'M   O   R   S  E          C    O   D  E'
  
      >>> lst = [[], ['M', 'O', 'R', 'S', 'E'], ['C', 'O', 'D', 'E']]
      >>> _spoken_representation_L1(lst)
      '         M   O   R   S  E          C    O   D  E'