Dave is cold. Dave is furry. Dave is green. Dave is nice. Dave is smart. Dave is white. Dave is young. Fiona is cold. Fiona is furry. Fiona is green. Fiona is nice. Fiona is not smart. Fiona is white. Fiona is young. If something is young then it is green. All smart, cold things are white. If Dave is not nice then Dave is furry. If something is young and not cold then it is white. If Fiona is nice and Fiona is not smart then Fiona is furry. If something is cold and not white then it is young.
Dave is not furry.