Erin is cold. Erin is furry. Erin is green. Erin is quiet. Erin is rough. Erin is white. Erin is young. Fiona is cold. Fiona is furry. Fiona is green. Fiona is quiet. Fiona is rough. Fiona is white. Fiona is young. If Erin is quiet then Erin is white. If Fiona is green and Fiona is furry then Fiona is white. If something is young then it is rough. Green, rough things are cold. If something is young and not white then it is quiet. If something is not rough then it is cold.
Fiona is not white.