Bob is cold. Bob is furry. Bob is red. Bob is rough. Bob is round. Bob is smart. Bob is not young. Dave is cold. Dave is furry. Dave is red. Dave is smart. Dave is young. If something is not furry then it is red. If Dave is not rough then Dave is cold. If something is cold and not round then it is red. If Bob is round and Bob is not rough then Bob is not young. If something is red and not rough then it is cold. If something is rough then it is red.
Bob is not young.