Bob is big. Bob is nice. Bob is rough. Bob is round. Bob is young. Dave is furry. Dave is rough. Dave is round. Dave is smart. Dave is young. Fiona is rough. Fiona is young. Harry is furry. Harry is nice. Harry is round. Harry is smart. Young, rough things are smart. All smart things are nice. If Fiona is furry then Fiona is smart.
Harry is not rough.