Bob is quiet. Bob is smart. Bob is young. Charlie is round. Charlie is white. Charlie is young. Dave is blue. Dave is round. Dave is white. Fiona is furry. Fiona is quiet. Fiona is smart. If someone is young and smart then they are blue. If Dave is young and Dave is furry then Dave is blue. All smart people are furry. If Charlie is blue and Charlie is furry then Charlie is white. All smart, young people are round. If someone is smart and round then they are blue. All quiet people are round. All round people are blue.
Fiona is not round.