vale sumar y restar no
vale sumar y restar no ?
β a l e̞ WORD_BOUNDARY s u m a ɾ WORD_BOUNDARY i WORD_BOUNDARY ɾ e̞ s t a ɾ WORD_BOUNDARY n o̞ WORD_BOUNDARY
v a l e WORD_BOUNDARY s u m a r WORD_BOUNDARY y WORD_BOUNDARY r e s t a r WORD_BOUNDARY n o WORD_BOUNDARY ? WORD_BOUNDARY