atama kaikai kaikai kaikaikai kaikai
atama kaikai kaikai kaikaikai kaikai .
a t a m a WORD_BOUNDARY k a i k a i WORD_BOUNDARY k a i k a i WORD_BOUNDARY k a i k a i k a i WORD_BOUNDARY k a i k a i WORD_BOUNDARY
a t a m a WORD_BOUNDARY k a i k a i WORD_BOUNDARY k a i k a i WORD_BOUNDARY k a i k a i k a i WORD_BOUNDARY k a i k a i WORD_BOUNDARY