es difícil o es fácil
es difícil o es fácil ?
e s WORD_BOUNDARY ð i f i θ i l WORD_BOUNDARY o WORD_BOUNDARY e s WORD_BOUNDARY f a θ i l WORD_BOUNDARY
e s WORD_BOUNDARY d i f í c i l WORD_BOUNDARY o WORD_BOUNDARY e s WORD_BOUNDARY f á c i l WORD_BOUNDARY