Bob is nice. Bob is young. Charlie is furry. Charlie is nice. Charlie is round. Dave is cold. Dave is nice. Dave is rough. Fiona is not nice. Fiona is not young. All young people are round. If someone is green and not furry then they are not round. If someone is cold and furry then they are rough. All rough people are cold. All cold, young people are nice. If someone is cold and furry then they are young. Nice people are round. If Bob is rough and Bob is not young then Bob is round.
Dave is rough.