esa es la letra a
esa es la letra a .
e̞ s a WORD_BOUNDARY e̞ s WORD_BOUNDARY l a WORD_BOUNDARY l e̞ t ɾ a WORD_BOUNDARY a WORD_BOUNDARY
e s a WORD_BOUNDARY e s WORD_BOUNDARY l a WORD_BOUNDARY l e t r a WORD_BOUNDARY a WORD_BOUNDARY . WORD_BOUNDARY