Dave is cold. Dave is furry. Dave is smart. Fiona is furry. Fiona is nice. Harry is green. Harry is nice. Nice, quiet things are not cold. If something is round and not cold then it is quiet. Green, smart things are quiet. If something is quiet and not furry then it is green. All furry things are round. If Harry is nice and Harry is not quiet then Harry is not furry.
Dave is not green.