Dave is green. Erin is furry. Erin is red. Fiona is furry. Fiona is nice. Fiona is quiet. Fiona is red. Harry is big. Harry is green. Harry is quiet. Harry is round. Red people are quiet. All quiet, green people are round. If someone is green then they are red. All quiet people are furry. If someone is furry and big then they are nice. If Harry is round and Harry is big then Harry is quiet. Furry people are big.
Erin is not round.