def METHOD_NAME(self, dt=None):
    try:
        word = next(self.words)
    except StopIteration:
        return
    for content_widget in self.text_content_widgets:
        content_widget.text += word + ' '
    pause_time = 0.03 * len(word)
    if word.endswith(','):
        pause_time += 0.6
    self._add_word_ev = Clock.schedule_once(self.METHOD_NAME, pause_time)