Bob is round. Dave is big. Dave is furry. Dave is nice. Dave is rough. Dave is round. Erin is big. Erin is blue. Erin is rough. Fiona is furry. If someone is white and blue then they are nice. Nice, furry people are rough. White people are blue. If someone is furry and not round then they are white. Nice, rough people are big. If someone is not blue then they are furry. If someone is not rough then they are not white. If Bob is rough and Bob is not furry then Bob is big.
Erin is not round.