Dave is blue. Dave is green. Dave is nice. Dave is quiet. Dave is smart. Fiona is blue. Fiona is furry. Fiona is green. Fiona is nice. Fiona is quiet. Fiona is smart. Fiona is young. All quiet, blue things are furry. Quiet, blue things are young. If Fiona is furry and Fiona is young then Fiona is smart.
Dave is not furry.