Dave is blue. Dave is kind. Dave is quiet. Dave is white. Gary is quiet. Gary is rough. Gary is white. If something is quiet and not green then it is blue. If something is blue then it is white. All blue things are white. All blue, rough things are kind. If Dave is not quiet then Dave is blue. Green, quiet things are rough. All blue, kind things are not green. All nice things are blue.
Dave is not rough.