Alan is strong. Alan is huge. Charlie is thin. Charlie is little. Dave is nice. Fiona is poor. Fiona is bad. If someone is not high then they are poor. If someone is not sad then they are quiet. If someone is nice then they are wealthy. If someone is wealthy and not rough then they are kind. If someone is poor and not high then they are dull. If someone is thin and little then they are rough. If someone is rough and not wealthy then they are bad. All quiet people are smart. 
Alan is not dull.