a ver este tren a dónde va
a ver este tren a dónde va ?
a WORD_BOUNDARY β e ɾ WORD_BOUNDARY e s t e WORD_BOUNDARY t ɾ e n WORD_BOUNDARY a WORD_BOUNDARY ð o n d e WORD_BOUNDARY β a WORD_BOUNDARY
a WORD_BOUNDARY v e r WORD_BOUNDARY e s t e WORD_BOUNDARY t r e n WORD_BOUNDARY a WORD_BOUNDARY d ó n d e WORD_BOUNDARY v a WORD_BOUNDARY