este es le mas difícil
este es le mas difícil !
e s t e WORD_BOUNDARY e s WORD_BOUNDARY l e WORD_BOUNDARY m a s WORD_BOUNDARY ð i f i θ i l WORD_BOUNDARY
e s t e WORD_BOUNDARY e s WORD_BOUNDARY l e WORD_BOUNDARY m a s WORD_BOUNDARY d i f í c i l WORD_BOUNDARY