Bob is big. Bob is nice. Bob is rough. Erin is big. Erin is green. Erin is nice. Erin is rough. Erin is round. Erin is white. Erin is young. Fiona is big. Fiona is nice. Round people are green. If someone is big then they are young. All rough, young people are big. All rough, green people are round. If Fiona is rough then Fiona is round. All nice, rough people are green. All young, round people are rough. If someone is green and round then they are big.
Erin is not white.