un pato y un cisne
un pato y un cisne .
u n WORD_BOUNDARY p a t o̞ WORD_BOUNDARY i WORD_BOUNDARY u n WORD_BOUNDARY s i s n e̞ WORD_BOUNDARY
u n WORD_BOUNDARY p a t o WORD_BOUNDARY y WORD_BOUNDARY u n WORD_BOUNDARY c i s n e WORD_BOUNDARY . WORD_BOUNDARY