entonces empiezan a
entonces empiezan a .
e̞ n t o̞ n s e̞ s WORD_BOUNDARY e̞ m p j e̞ s a n WORD_BOUNDARY a WORD_BOUNDARY
e n t o n c e s WORD_BOUNDARY e m p i e z a n WORD_BOUNDARY a WORD_BOUNDARY . WORD_BOUNDARY