answer: #Person1# shows Sandra the beautiful postcard from #Person2#'s aunt.
documents: #Person1#: Look, Sandra. I got this really nice postcard from my aunt.
  #Person2#: Oh, what a pretty village and it's right by a river. Is it in the mountains?
  #Person1#: Yes. But you can't see them in the picture.
  #Person2#: Perhaps they're behind those tall trees.