Bob is big. Bob is furry. Bob is quiet. Bob is white. Bob is young. Erin is furry. Erin is green. Erin is quiet. Erin is young. Fiona is big. Fiona is furry. Fiona is green. Fiona is quiet. Fiona is smart. Fiona is white. If Bob is quiet then Bob is green. All quiet, white things are green.
Bob is not smart.