paipai nanka nainai yo
paipai nanka nainai yo .
p a i p a i WORD_BOUNDARY n a n k a WORD_BOUNDARY n a i n a i WORD_BOUNDARY j o WORD_BOUNDARY
p a i p a i WORD_BOUNDARY n a n k a WORD_BOUNDARY n a i n a i WORD_BOUNDARY y o WORD_BOUNDARY