Bob is big. Bob is furry. Bob is not green. Bob is quiet. Bob is red. Bob is not smart. Bob is young. Fiona is big. Fiona is not furry. Fiona is green. Fiona is quiet. Fiona is red. Fiona is smart. Fiona is young. If someone is not smart and not young then they are big. All furry, smart people are red. If someone is smart and not quiet then they are not big.
Bob is young.