Erin is green. Fiona is blue. Gary is green. If someone is green and not white then they are not young. If Erin is green and Erin is red then Erin is not young. All cold, green people are not red. If someone is blue and not cold then they are green. All red, cold people are young. If Fiona is white then Fiona is not green.
Fiona is not young.