está tocando el piano
está tocando el piano .
e̞ s t a WORD_BOUNDARY t o̞ k a n d o̞ WORD_BOUNDARY e̞ l WORD_BOUNDARY p j a n o̞ WORD_BOUNDARY
e s t á WORD_BOUNDARY t o c a n d o WORD_BOUNDARY e l WORD_BOUNDARY p i a n o WORD_BOUNDARY . WORD_BOUNDARY