Bob is cold. Bob is furry. Bob is green. Bob is not nice. Bob is rough. Dave is furry. Dave is green. Dave is nice. Dave is rough. Erin is cold. If something is furry then it is cold. All cold things are quiet. If something is white then it is quiet. If Dave is quiet then Dave is white. If Dave is nice and Dave is rough then Dave is green. If Erin is not cold then Erin is rough. If something is furry and not cold then it is not white. If something is not furry and not quiet then it is not green.
Bob is quiet.