se nadar hacia atrás
se nadar hacia atrás .
s e̞ WORD_BOUNDARY n a d a ɾ WORD_BOUNDARY a s i a WORD_BOUNDARY a t ɾ a s WORD_BOUNDARY
s e WORD_BOUNDARY n a d a r WORD_BOUNDARY h a c i a WORD_BOUNDARY a t r á s WORD_BOUNDARY . WORD_BOUNDARY