Dave is round. Fiona is round. Gary is rough. Harry is furry. All green things are young. If Harry is rough and Harry is round then Harry is furry. If Harry is furry and Harry is young then Harry is not round. If Fiona is not green then Fiona is furry. If Fiona is round and Fiona is young then Fiona is furry. If Dave is rough and Dave is green then Dave is furry. If Harry is kind and Harry is furry then Harry is not young. If something is round and not young then it is furry.
Gary is not furry.