Dave is furry. Erin is blue. Erin is furry. Erin is green. Erin is nice. Erin is quiet. Erin is rough. Erin is smart. Fiona is green. Fiona is nice. Fiona is quiet. Fiona is rough. Harry is quiet. Harry is smart. If Dave is rough and Dave is smart then Dave is green. Nice people are rough. If someone is green and smart then they are blue. If someone is nice and rough then they are green. Smart people are furry. Smart, furry people are green. If Harry is quiet and Harry is blue then Harry is nice.
Fiona is not green.