Charlie is furry. Charlie is red. Charlie is rough. Charlie is smart. Dave is cold. Dave is furry. Dave is quiet. Dave is rough. Dave is smart. Dave is young. Fiona is cold. Fiona is red. Fiona is rough. Fiona is young. Harry is quiet. Harry is smart. If Charlie is furry then Charlie is quiet. All red things are furry. All cold things are rough. All red things are furry. If Dave is rough and Dave is young then Dave is red. If Fiona is smart then Fiona is quiet. If something is red and young then it is furry. All rough, quiet things are young.
Harry is not furry.