Dave is blue. Dave is green. Dave is rough. Dave is not young. Fiona is blue. Fiona is furry. Fiona is green. If something is furry and not green then it is rough. All cold things are blue. If Dave is furry and Dave is not green then Dave is rough. Rough, nice things are not cold. Furry things are rough. Green things are furry. If something is not furry then it is nice. If Dave is not nice and Dave is not rough then Dave is not blue.
Dave is rough.