Bob is blue. Bob is furry. Bob is green. Bob is quiet. Bob is red. Bob is rough. Bob is white. Dave is blue. Dave is furry. Dave is quiet. Dave is white. Fiona is furry. All quiet people are green. If Dave is red and Dave is blue then Dave is rough. Rough, blue people are green. All rough, white people are green. If Fiona is red and Fiona is green then Fiona is furry. All white, red people are furry. Quiet people are red. If someone is furry and rough then they are red.
Dave is not blue.