Anne is blue. Anne is furry. Anne is round. Bob is cold. Bob is young. Erin is blue. Erin is cold. Erin is furry. Erin is rough. Erin is round. Gary is green. Gary is round. If someone is blue and round then they are rough. If someone is green and rough then they are furry. Young people are green. All blue, cold people are rough. Furry, green people are blue. Cold, green people are blue. If someone is furry and young then they are round.
Erin is not young.