Bob is green. Bob is red. Bob is not round. Bob is young. Dave is blue. Erin is round. Fiona is green. If Dave is red then Dave is young. All round people are green. If Dave is young and Dave is not red then Dave is round. All blue people are green. If Dave is green then Dave is young. Green, nice people are white. All round people are nice. All red people are white. If someone is round and not green then they are nice.
Erin is not blue.