Bob is furry. Bob is nice. Bob is quiet. Bob is young. Dave is blue. Erin is furry. Erin is nice. Erin is quiet. Erin is red. Fiona is quiet. Fiona is red. Furry people are round. All round, young people are nice. All quiet, round people are blue. Red, nice people are young. Furry, round people are nice. Blue people are furry. All quiet people are blue. If someone is young and nice then they are quiet.
Bob is not red.