nos falta una pieza
nos falta una pieza ?
n o̞ s WORD_BOUNDARY f a l t a WORD_BOUNDARY u n a WORD_BOUNDARY p j e̞ s a WORD_BOUNDARY
n o s WORD_BOUNDARY f a l t a WORD_BOUNDARY u n a WORD_BOUNDARY p i e z a WORD_BOUNDARY ? WORD_BOUNDARY