Dave is green. Dave is rough. Dave is smart. Dave is young. Fiona is big. Fiona is blue. Fiona is green. Fiona is rough. Fiona is smart. Fiona is young. Smart, round people are blue. If someone is blue then they are round. All green, rough people are big. If Dave is big then Dave is round. Blue, smart people are big. Big, blue people are rough. If someone is round then they are green. If someone is big and young then they are green.
Fiona is not round.