Bob is furry. Bob is red. Bob is rough. Bob is round. Bob is smart. Dave is furry. Dave is quiet. Dave is rough. Harry is cold. Harry is furry. Harry is quiet. Harry is smart. Red, smart people are rough. Smart people are round. All furry, round people are red. Cold, red people are rough. Quiet people are smart. If Bob is rough and Bob is cold then Bob is round.
Bob is not rough.