Alan is huge. Alan is strong. Charlie is short. Charlie is thin. Dave is nice. Gary is dull. Gary is bad. If someone is not big then they are dull. If someone is not sad then they are quiet. If someone is nice then they are clever. If someone is clever and not poor then they are wealthy. If someone is dull and not big then they are rough. All rough people are small. If someone is short and thin then they are poor. If someone is poor and not clever then they are bad. If someone is bad then they are young. If someone is quiet then they are kind. All kind people are smart. All wealthy people are old. 
Gary is smart.