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