Bob is not green. Bob is white. Bob is young. Dave is furry. Dave is quiet. Dave is white. Dave is young. Erin is blue. Erin is green. Erin is white. Harry is not blue. Harry is furry. Harry is quiet. Harry is rough. Harry is not white. All white people are blue. If Harry is quiet and Harry is green then Harry is rough. If Harry is green and Harry is rough then Harry is white.
Bob is not young.