y ibais a la playa
y ibais a la playa ?
i WORD_BOUNDARY i β a i s WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY p l a j a WORD_BOUNDARY
y WORD_BOUNDARY i b a i s WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY p l a y a WORD_BOUNDARY ? WORD_BOUNDARY