entraban piedras a dónde
entraban piedras a dónde ?
e n t ɾ a β a m WORD_BOUNDARY p j e ð ɾ a s WORD_BOUNDARY a WORD_BOUNDARY ð o n d e WORD_BOUNDARY
e n t r a b a n WORD_BOUNDARY p i e d r a s WORD_BOUNDARY a WORD_BOUNDARY d ó n d e WORD_BOUNDARY