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