Dave is big. Dave is not furry. Dave is nice. Dave is round. Fiona is big. Fiona is kind. Gary is nice. If something is big and kind then it is not young. If something is kind and not young then it is furry. All nice, young things are round. All kind, big things are furry. If something is round and not big then it is not kind. If Fiona is not furry and Fiona is not kind then Fiona is not young.
Gary is not young.