Dave is blue. Dave is furry. Dave is green. Dave is quiet. Dave is red. Dave is smart. Dave is white. Fiona is not blue. Fiona is not furry. Fiona is green. Fiona is quiet. Fiona is red. Fiona is smart. Fiona is not white. All furry things are smart. If something is not green and not furry then it is white. If something is not red then it is not blue.
Dave is not furry.