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