Bob is blue. Bob is green. Bob is kind. Bob is nice. Bob is rough. Bob is round. Bob is young. Dave is blue. Dave is green. Dave is nice. Dave is rough. Dave is round. Dave is young. Erin is blue. Erin is green. Erin is nice. Round, green things are kind. If Erin is rough then Erin is round. All kind, young things are nice. Green things are rough. If something is rough and round then it is blue. All nice things are rough.
Dave is not blue.